DGGS
State of Alaska Alaska / Natural Resources DNR / Geological & Geophysical Surveys DGGS / PublicationsPubs / DGGS SeriesDGGS / ICIC

DGGS Information Circular Publications

Information Circulars include a variety of publications (brochures, pamphlets, maps) that are designed to provide specific information in a brief, user-friendly form.

IC 96 Report
Larsen, M.C., Nicolazzo, J.A., and Athey, J.E., 2023, Landslide hazards in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 96, 2 p. https://doi.org/10.14509/31100
IC 95 Report
DGGS Staff, Janssen, K.A., and Hubbard, T.D., 2024, The Hydrology & Surficial Geology Section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 95, 2 p. https://doi.org/10.14509/31043
IC 94 Report
Janssen, K.A., and DGGS Staff, 2023, Services of the Alaska Division of Geological & Geophysical Surveys: Alaska Division of Geological & Geophysical Surveys Information Circular 94, 2 p. https://doi.org/10.14509/31014
IC 93 Report
Cameron, C.E., and Janssen, K.A., 2023, Mount Edgecumbe: Ongoing volcanic unrest and response actions: Alaska Division of Geological & Geophysical Surveys Information Circular 93, 2 p. https://doi.org/10.14509/30904
IC 92 Report Outside Link
Garcia, M.R., Goh, Raquel, Nelson, M.A., Athey, J.E., and Nash, A.L., Jr., 2021, Radon in Alaska: What you should know - video: Alaska Division of Geological & Geophysical Surveys Information Circular 92, 2 p. https://doi.org/10.14509/30745
IC 91 Report
Salisbury, J.B., Suleimani, E.N., Nicolsky, D.J., and West, M.E., 2021, Tsunami hazards: Frequently asked questions: Alaska Division of Geological & Geophysical Surveys Information Circular 91, 2 p. https://doi.org/10.14509/30581
IC 90 Report
Knapp, S.P., Athey, J.E., and Nash, A.L., Jr., 2020, Mitigating radon levels at home: Alaska Division of Geological & Geophysical Surveys Information Circular 90, 18 p. https://doi.org/10.14509/30474
IC 89 Report
Knapp, S.P., Athey, J.E., and Nash, A.L., Jr., 2020, Understanding your radon test results: Alaska Division of Geological & Geophysical Surveys Information Circular 89, 5 p. https://doi.org/10.14509/30467
IC 88 Report
Salisbury, J.B., Strait, S.H., and Ruppert, Natalia, 2020, Earthquake early warning system for Alaska: fact sheet: Alaska Division of Geological & Geophysical Surveys Information Circular 88, 2 p. https://doi.org/10.14509/30454
IC 87 Report
Daanen, R.P., 2020, Naturally occurring holes in ice: Alaska Division of Geological & Geophysical Surveys Information Circular 87, 2 p. https://doi.org/10.14509/30420
IC 86 Report
Schaefer, J.R.G., Perreault, J.M., Larsen, J.F., and Vallance, J.W., 2020, Makushin Volcano ash hazards: Alaska Division of Geological & Geophysical Surveys Information Circular 86, 2 p. https://doi.org/10.14509/30411
IC 85 v. 2 Report
Salisbury, J.B., and Janssen, K.A., 2022, Tsunamis in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 85 v. 2, 2 p. https://doi.org/10.14509/30849
IC 85 Report
Salisbury, J.B., and Janssen, K.A., 2019, Tsunamis in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 85, 2 p. https://doi.org/10.14509/30199
IC 84 Report
Buzard, R.M., Overbeck, J.R., and Maio, C.V., 2019, Community-based methods for monitoring coastal erosion: Alaska Division of Geological & Geophysical Surveys Information Circular 84, 35 p. https://doi.org/10.14509/30182
IC 83 Report
Athey, J.E., and Salisbury, J.B., 2019, Radon testing after earthquakes: Alaska Division of Geological & Geophysical Surveys Information Circular 83, 2 p. https://doi.org/10.14509/30168
IC 82 Report
Athey, J.E., 2019, Naturally occurring radon in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 82, 2 p. https://doi.org/10.14509/30163
IC 82 v. 2 Report
Goodfellow, P.J., Woodward, A.D., and Athey, J.E., 2024, Naturally occurring radon in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 82 v. 2, 2 p. https://doi.org/10.14509/31109
IC 81 Report
Athey, J.E., 2019, Naturally occurring asbestos in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 81, 2 p. https://doi.org/10.14509/30162
IC 80 Report
Johnson, K.J., and Riordan, J.A., 2019, The Alaska Geologic Materials Center at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 80, 2 p. https://doi.org/10.14509/30159
IC 79 Report
Werdon, M.B., 2019, The Mineral Resources section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 79, 2 p. https://doi.org/10.14509/30158
IC 78 Report
Emond, A.M., Graham, G.R.C., and Janssen, K.A., 2019, Geophysics in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 78, 2 p. https://doi.org/10.14509/30157
IC 77 Report
Salisbury, J.B., 2019, Living with earthquakes in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 77, 2 p. https://doi.org/10.14509/30144
IC 76 Report
Stevens, D.S.P., 2019, The Engineering Geology section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 76, 2 p. https://doi.org/10.14509/30122
IC 75 v. 2 Report
LePain, D.L., Wartes, M.A., and Janssen, K.A., 2022, The Energy Resources section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 75 v. 2, 2 p. https://doi.org/10.14509/30869
IC 75 Report
LePain, D.L., 2019, The Energy Resources section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 75, 2 p. https://doi.org/10.14509/30121
IC 74 Report
Mulliken, K.M., 2018, The Volcanology section at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 74, 2 p. https://doi.org/10.14509/30118
IC 73 Report
Salisbury, J.B., 2019, Earthquakes in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 73, 2 p. https://doi.org/10.14509/30097
IC 72 Report
Overbeck, J.R., ed., 2018, Alaska coastal mapping gaps & priorities: Alaska Division of Geological & Geophysical Surveys Information Circular 72, 34 p. https://doi.org/10.14509/30096
IC 71 Report
Athey, J.E., and Daanen, R.P., 2018, Naturally occurring arsenic in interior Alaska groundwater: Alaska Division of Geological & Geophysical Surveys Information Circular 71, 2 p. https://doi.org/10.14509/30094
IC 69 Report
Athey, J.E., Daanen, R.P., and Hendricks, K.A., 2018, Naturally occurring arsenic in Alaska groundwater: Alaska Division of Geological & Geophysical Surveys Information Circular 69, 2 p. https://doi.org/10.14509/30060
IC 68 Report
Overbeck, J.R., 2018, Coastal flooding & erosion in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 68, 2 p. https://doi.org/10.14509/30057
IC 67 Report
Mulliken, K.M., 2018, The Alaska Volcano Observatory: 30 years of protecting Alaskans from the effects of volcanic activity (1988-2018): Alaska Division of Geological & Geophysical Surveys Information Circular 67, 2 p. https://doi.org/10.14509/30032
IC 66 Report
Hendricks, K.A., and Papp, K.R., 2018, The Alaska Geologic Information Center at DGGS: Alaska Division of Geological & Geophysical Surveys Information Circular 66, 2 p. https://doi.org/10.14509/29853
IC 65 Report
Stevens, D.S.P., Wolken, G.J., Hubbard, T.D., and Hendricks, K.A., 2018, Landslides in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 65, 2 p. https://doi.org/10.14509/29849
IC 64 Report
Wolken, G.J., Hendricks, K.A., Daanen, R.P., Overbeck, J.R., Stevens, D.S.P., and Masterman, S.S., 2017, Alaska & climate change: Alaska Division of Geological & Geophysical Surveys Information Circular 64, 2 p. https://doi.org/10.14509/29781
IC 63 Report
Timm, Kristin, and Wolken, G.J., 2017, Deglacierization and the development of glacier-related hazards: Alaska Division of Geological & Geophysical Surveys Information Circular 63, 3 p. https://doi.org/10.14509/29752
IC 61 Report
Szumigala, D.J., and Werdon, M.B., 2011, Rare-Earth Elements: A brief overview including uses, worldwide resources, and known occurrences in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 61, 12 p. https://doi.org/10.14509/22262
IC 60 Report
Hughes, R.A., Szumigala, D.J., and Harbo, L.A., 2010, Alaska's mineral industry 2009: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 60, 15 p. https://doi.org/10.14509/21061
IC 59 v. 2 Report
Cameron, C.E., Hendricks, K.A., and Nye, C.J., 2017, Historically active volcanoes of Alaska reference deck: Alaska Division of Geological & Geophysical Surveys Information Circular 59 v. 2, 4 p. https://doi.org/10.14509/29738
IC 59 v. 3 Report
Cameron, C.E., Janssen, K.A., Orr, T., and Loewen, M.W., 2023, Historically active volcanoes of Alaska reference deck: Alaska Division of Geological & Geophysical Surveys Information Circular 59 v. 3, 4 p. https://doi.org/10.14509/31019
IC 59 Report
Snedigar, S.F., and Cameron, C.E., 2009, Historically active volcanoes of Alaska reference deck: Alaska Division of Geological & Geophysical Surveys Information Circular 59, 52 p. https://doi.org/10.14509/20401
IC 58 Report
Szumigala, D.J., Hughes, R.A., and Harbo, L.A., 2009, Alaska's mineral industry 2008: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 58, 15 p. https://doi.org/10.14509/19601
IC 57 v. 1.0.1 Report
Szumigala, D.J., and Hughes, R.A., 2008, Alaska's mineral industry 2007: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 57 v. 1.0.1, 15 p. https://doi.org/10.14509/16701
IC 56 Report
Athey, J.E., 2007, Using geologic maps: Alaska Division of Geological & Geophysical Surveys Information Circular 56, 2 p. https://doi.org/10.14509/15754
IC 55 Report
Athey, J.E., 2007, Geologic maps: solving problems by understanding our world: Alaska Division of Geological & Geophysical Surveys Information Circular 55, 2 p. https://doi.org/10.14509/15753
IC 54 Report
Szumigala, D.J., and Hughes, R.A., 2007, Alaska's mineral industry 2006: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 54, 20 p. https://doi.org/10.14509/15755
IC 53 Report
Freeman, L.K., 2006, AKGEOLOGY.INFO: An online portal for Alaska geologic and mineral resources information: Alaska Division of Geological & Geophysical Surveys Information Circular 53, 15 p. https://doi.org/10.14509/15747
IC 52 Report
Szumigala, D.J., and Hughes, R.A., 2006, Alaska's mineral industry 2005: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 52, 19 p. https://doi.org/10.14509/14909
IC 51 Report
Szumigala, D.J., and Hughes, R.A., 2005, Alaska's mineral industry 2004: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 51, 18 p. https://doi.org/10.14509/7083
IC 50 Report
Szumigala, D.J., 2004, Alaska's mineral industry 2003: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 50, 12 p. https://doi.org/10.14509/3211
IC 49 Report
Szumigala, D.J., and Swainbank, R.C., 2003, Alaska's mineral industry 2002: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 49, 15 p. https://doi.org/10.14509/2876
IC 48 Report
Swainbank, R.C., and Szumigala, D.J., 2002, Alaska's mineral industry 2001: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 48, 15 p. https://doi.org/10.14509/2774
IC 47 Report
Szumigala, D.J., and Swainbank, R.C., 2001, Alaska's mineral industry 2000: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 47, 14 p. https://doi.org/10.14509/2662
IC 46 Report
Swainbank, R.C., and Szumigala, D.J., 2000, Alaska's mineral industry 1999: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 46, 12 p. https://doi.org/10.14509/3236
IC 45 Report
Szumigala, D.J., and Swainbank, R.C., 1999, Alaska's mineral industry 1998: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 45, 12 p. https://doi.org/10.14509/491
IC 44 ed. 2004 Report
Daley, E.E., 2004, Guide to Alaska geologic and mineral information 2004: Alaska Division of Geological & Geophysical Surveys Information Circular 44 ed. 2004, 92 p. https://doi.org/10.14509/3318
IC 44 Report
Daley, E.E., 1998, Guide to Alaska geologic and mineral information: Alaska Division of Geological & Geophysical Surveys Information Circular 44, 90 p. https://doi.org/10.14509/490
IC 43 Report
Swainbank, R.C., and Clautice, K.H., 1998, Alaska's mineral industry 1997: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 43, 12 p. https://doi.org/10.14509/489
IC 42 Report
Swainbank, R.C., Bundtzen, T.K., Clough, A.H., and Henning, M.W., 1997, Alaska's mineral industry 1996: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 42, 12 p. https://doi.org/10.14509/488
IC 41 Report
Bundtzen, T.K., Swainbank, R.C., Clough, A.H., Henning, M.W., and Charlie, K.M., 1996, Alaska's mineral industry 1995: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 41, 12 p. https://doi.org/10.14509/487
IC 40 Report
Swainbank, R.C., and Bundtzen, T.K., 1995, Alaska's mineral industry 1994: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 40, 11 p. https://doi.org/10.14509/486
IC 39 Report
Bundtzen, T.K., Swainbank, R.C., Clough, A.H., Henning, M.W., and Hansen, E.W., 1994, Alaska's mineral industry 1993: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 39, 11 p. https://doi.org/10.14509/485
IC 38 Map
Nye, C.J., 1995, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 38, 2 sheets, scale 1:4,000,000. https://doi.org/10.14509/484
IC 38 ed. 1998 Report Map Geospatial Data
Nye, C.J., 1998, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 38 ed. 1998, 1 p., 2 sheets, scale 1:4,000,000. https://doi.org/10.14509/7043
IC 36 Report
Swainbank, R.C., Bundtzen, T.K., Clough, A.H., and Hansen, E.W., 1993, Alaska's mineral industry 1992: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 36, 11 p. https://doi.org/10.14509/483
IC 35 Report
Bundtzen, T.K., Swainbank, R.C., Wood, J.E., and Clough, A.H., 1992, Alaska's mineral industry 1991: A summary: Alaska Division of Geological & Geophysical Surveys Information Circular 35, 11 p. https://doi.org/10.14509/482
IC 34 Map
Alaska Division of Geological & Geophysical Surveys, 1991, Taku Glacier: Alaska Division of Geological & Geophysical Surveys Information Circular 34, 2 sheets, scale 1:63,360. https://doi.org/10.14509/481
IC 33 Report
Alaska Division of Geological & Geophysical Surveys, 1990, Alaska's high-rank coals: Alaska Division of Geological & Geophysical Surveys Information Circular 33, 36 p. https://doi.org/10.14509/480
IC 32 ed. 1990 Report
Alaska Division of Geological & Geophysical Surveys, 1990, Directory of aggregate, rock, and soil producers in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 32 ed. 1990, 55 p. https://doi.org/10.14509/479
IC 32 Report
Pinney, D.S., and Duenwald, E.S., 2001, Directory of aggregate, rock, and soil producers in Alaska (updated 2001): Alaska Division of Geological & Geophysical Surveys Information Circular 32, 19 p. https://doi.org/10.14509/2772
IC 31 Report
Alaska Division of Geological & Geophysical Surveys, 1985, Oil and gas resources of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 31, 9 p. https://doi.org/10.14509/478
IC 30 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Alaska heritage resources survey: Alaska Division of Geological & Geophysical Surveys Information Circular 30, 4 p. https://doi.org/10.14509/477
IC 29 Report
Alaska Division of Geological & Geophysical Surveys, 1985, Drilling a water well?: Alaska Division of Geological & Geophysical Surveys Information Circular 29, 12 p. https://doi.org/10.14509/476
IC 28 Report
Alaska Division of Geological & Geophysical Surveys, 1983, Uses of geologic maps explained: Alaska Division of Geological & Geophysical Surveys Information Circular 28, 4 p. https://doi.org/10.14509/475
IC 27 Report
Alaska Division of Geological & Geophysical Surveys, 1986, Alaska Geologic Materials Center: Alaska Division of Geological & Geophysical Surveys Information Circular 27, 2 p. https://doi.org/10.14509/474
IC 26 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Investigate that claim before buying: Alaska Division of Geological & Geophysical Surveys Information Circular 26, 5 p. https://doi.org/10.14509/473
IC 25 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Information on water and water rights in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 25, 6 p. https://doi.org/10.14509/472
IC 24 Map
Alaska Division of Geological & Geophysical Surveys, 1985, Mining-claim districts and recording offices in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 24, 1 sheet, scale 1 inch = approx. 89 miles. https://doi.org/10.14509/471
IC 23 Report Map
Alaska Division of Geological & Geophysical Surveys, 1987, Map of DGGS publications with author and quadrangle indexes: Alaska Division of Geological & Geophysical Surveys Information Circular 23, 44 p., 2 sheets. https://doi.org/10.14509/470
IC 22 Report
Conwell, C.N., 1976, Progress and prospects in marine mining in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 22, 5 p. https://doi.org/10.14509/469
IC 21 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Geologic-hazards information, sources and consultants: Alaska Division of Geological & Geophysical Surveys Information Circular 21, 21 p. https://doi.org/10.14509/468
IC 20 Report
Alaska Division of Geological & Geophysical Surveys, 1984, State of Alaska aeromagnetic surveys: Alaska Division of Geological & Geophysical Surveys Information Circular 20, 6 p. https://doi.org/10.14509/467
IC 19 Report
Alaska Division of Geological & Geophysical Surveys, 1974, The status of mining claims located on native lands: Alaska Division of Geological & Geophysical Surveys Information Circular 19, 8 p. https://doi.org/10.14509/466
IC 18 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Amateur gold prospecting in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 18, 5 p. https://doi.org/10.14509/465
IC 17 Report
Alaska Division of Geological & Geophysical Surveys, 1983, Coal resources of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 17, 9 p. https://doi.org/10.14509/464
IC 16 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Alaska map information: Alaska Division of Geological & Geophysical Surveys Information Circular 16, 3 p. https://doi.org/10.14509/463
IC 15 Report
Alaska Division of Geological Survey, 1969, A prospector's guide to the sale and lease of mineral properties: Alaska Division of Geological Survey Information Circular 15, 9 p. https://doi.org/10.14509/462
IC 14 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Mining laws applicable in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 14, 34 p. https://doi.org/10.14509/461
IC 13 Report
Alaska Division of Geological Survey, 1962, Dangers in old mine openings: Alaska Division of Mines and Minerals Information Circular 13, 1 p. https://doi.org/10.14509/460
IC 12 Report
Hendricks, K.A., 2017, Services of the Alaska Division of Geological & Geophysical Surveys: Alaska Division of Geological & Geophysical Surveys Information Circular 12, 2 p. https://doi.org/10.14509/459
IC 11 Report
Alaska Division of Geological & Geophysical Surveys, 1996, Reports and maps issued by the Alaska Division of Geological and Geophysical Surveys: Alaska Division of Geological & Geophysical Surveys Information Circular 11, 121 p. https://doi.org/10.14509/458
IC 10 Report
Alaska Division of Mines and Geology, 1968, Skin diving for gold in Alaska: Alaska Division of Mines and Geology Information Circular 10, 2 p. https://doi.org/10.14509/457
IC 9 Report
Alaska Division of Geological & Geophysical Surveys, 1978, Alaska rockhound information: Alaska Division of Geological & Geophysical Surveys Information Circular 9, 2 p. https://doi.org/10.14509/456
IC 8 Report
Alaska Division of Geological & Geophysical Surveys, 1986, Geological and mining consultants available for work in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 8, 32 p. https://doi.org/10.14509/455
IC 7 Report
Alaska Division of Geological & Geophysical Surveys, 1985, Alaskan companies and prospectors - 1983: Alaska Division of Geological & Geophysical Surveys Information Circular 7, 45 p. https://doi.org/10.14509/454
IC 6 Report
Alaska Division of Geological & Geophysical Surveys, 1978, Alaska prospecting information: Alaska Division of Geological & Geophysical Surveys Information Circular 6, 9 p. https://doi.org/10.14509/453
IC 5 Report
Alaska Division of Geological Survey, 1971, General Alaskan mineral and energy information: Alaska Division of Geological Survey Information Circular 5, 14 p. https://doi.org/10.14509/452
IC 4 Report
Alaska Division of Geological Survey, 1968, Uranium prospecting in Alaska: Alaska Division of Geological Survey Information Circular 4, 5 p. https://doi.org/10.14509/451
IC 3 Report
Alaska Division of Geological & Geophysical Surveys, 1982, Hand-placer mining methods: Alaska Division of Geological & Geophysical Surveys Information Circular 3, 14 p. https://doi.org/10.14509/450
IC 2 Report
Alaska Division of Geological Survey, 1968, Mineral rights of aliens in the State of Alaska: Alaska Division of Geological Survey Information Circular 2, 2 p. https://doi.org/10.14509/449
IC 1 Report
Alaska Division of Geological & Geophysical Surveys, 1984, Proper claim staking in Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular 1, 17 p. https://doi.org/10.14509/448

Publication Products

  • Report = Report
  • Disk = DVD/CD
  • Map = Maps
  • Geospatial Data = Geospatial Data
  • Outside Link = Outside Link
  • Interactive = Interactive
Copyright © 2024 · State of Alaska · Division of Geological & Geophysical Surveys · Webmaster