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Author
- Geological Survey (U.S.)254
- Geological Survey of Canada81
- Canada. Bureau of Geology and Topography21
- Geological Survey (South Africa)17
- Newfoundland. Mineral Development Division17
- Irwin, J. H., cartographer14
- McIntosh, Willard L.12
- Corbin, Paul, cartographer11
- Miller, Todd S.11
- Snyder, George L. (George Leonard), 1927-11
- Sveriges geologiska undersökning, issuing body11
- Faribault, E. R. (Eugène Rodolphe), 1860-10
- Cooley, M. E. (Maurice E.), cartographer9
- Geological Survey of Canada, issuing body9
- Ontario. Department of Mines9
- Muller, Ernest Hathaway, 1923-7
- Serviços Geológicos de Portugal7
- Barlow, Scott6
- Canada. Topographical Survey6
- Maryland Geological Survey6
