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- Geological Survey (U.S.)131
- Renshawe, John H.45
- Hawkins, Geo. T. (George T.)37
- Goodlove, C. W.31
- Herron, W. H. (William Harrison), 1865-27
- Marshall, R. B. (Robert Bradford), 1867-194924
- Illinois State Geological Survey20
- McKinney, R. C. (Robert C.)18
- United States. Army. Corps of Engineers18
- U.S. Coast and Geodetic Survey14
- U.S. Lake Survey14
- Ellis, J. R. (Topographer)11
- Kentucky Geological Survey10
- Gehres, W. S. (Wilmer Sherman), 1887-19639
- United States. Army Map Service9
- Blair, H. B. (Herbert Buxton), 1860-19058
- Cooke, Chas. E. (Charles E.)8
- Sadler, C. L.8
- Herrington, R. M. (Russell McKee), 1890-19777
- Griffin, W. H. (William H.)6