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- Geological Survey of Canada92
- Ontario. Department of Mines38
- Ontario Geological Survey14
- Collins, W. H. (William Henry), 1878-193713
- Bell, Robert, 1841-191712
- Barlow, Alfred E. (Alfred Ernest), 1861-191411
- Lawson, Andrew C. (Andrew Cowper), 1861-195210
- Ontario. Geological Branch10
- Ontario. Division of Mines8
- Ontario. Dept. of Mines7
- Adams, Frank D. (Frank Dawson), 1859-19426
- Caley, J. F.6
- Caley, John Fletcher, 1905-6
- Ells, R. W. (Robert Wheelock), 1845-19116
- Geological Survey (U.S.)6
- Ontario. Ministry of Natural Resources6
- Pye, E. G.6
- Bennett, Gerald, 1936-5
- Ontario. Department of Mines and Northern Affairs5
- Richard, S. H.5