Creator
- United States. Federal Insurance Administration4
- Wilson, Herbert M. (Herbert Michael), 1860-19204
- Clement, S. E. (Stephen Earl), 1894-19813
- Harrison, R. L. (Topographer)3
- Lloyd, W. J. (Topographer)3
- Michigan. State Highway Department3
- Miller, W. L. (Topographer)3
- Ohio. Division of Geological Survey3
- Smith, Glenn S. (Glenn Shepard)3
- Smith, L. Scott3
- United States. Army3
- Illinois. Department of Registration and Education2
- Indiana. Department of Conservation2
- Lovell, W. H. (William H.)2
- Michigan. Geological Survey Division2
- Plushnick, A. W. (Andrew Winfield), 1898-19802
- Sadler, C. L.2
- United States. Army. Air Corps2
- Burney, H. E.1
- Clarkson, C. D. S.1