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Author
- Geological Survey (U.S.)197
- United States. Bureau of Land Management142
- United States. Bureau of Land Management, cartographer42
- Geological Survey of Canada28
- Bateman, Andrew F.13
- Geological Survey of Alabama12
- Szabo, Michael W.9
- Ontario. Department of Mines8
- De Lacy, W. W. (Walter Washington), 1819-1892, cartographer7
- Barlow, Scott6
- Geological Survey (South Africa)6
- Baker & Harper, cartographer4
- Malaya. Geological Survey Dept4
- Ontario. Geological Branch4
- United States. Central Intelligence Agency4
- Allen, Elizabeth G.3
- Armstrong, J. E. (John Edward), 1912-3
- Beg, Mirza Akhtar, 1943-3
- Chaffin, Herbert S.3
- Geological Survey (U.S.), cartographer3
