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Author/Creator
- Geological Survey (U.S.)76
- Maps.com (Firm)41
- Bohannon, Robert G.31
- Afghanistan. Geological and Mineral Survey29
- Cress, Jill J. (Jill Janene)4
- Galuszka, Donna M.4
- NatureServe (Program)4
- Redding, Bonnie L.4
- Rosiek, Mark R. (Mark Robert), 1957-4
- Astrogeology Research Program (Geological Survey)3
- Afghanistan. Idārah-i ʻUmūmī-i Jiyūdīzī va Kārtūgrāfī2
- Arkansas Soil and Water Conservation Commission2
- Arthur, J. Kerry2
- Chirico, Pete2
- East, Jeffery W.2
- East, Joseph A.2
- Schaer, Jasper D.2
- United States. Agency for International Development2
- United States. Central Intelligence Agency2
- United States. Environmental Protection Agency2