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Creator
- Boyle, William F. Jr. 20
- Brown, James D. 20
- Bureau of Reclamation 20
- Byther, Harry S. 20
- Covington, Dwight A. 20
- Culter, Glynn R. 20
- Eck, William 20
- Frincke, Martin C. 20
- Hein, Eldor W. 20
- Hofman, Gotfried J. 20
- Johnson, Wilbur H. 20
- Lawton, Robert G. 20
- Newell, Lewis M. 20
- Nitta, William S. 20
- O'Leary, James E. 20
- Pritchard, Newton C. 20
- Soper, J. Frank 20
- United States. Department of the Interior 20
- Wilson, Bert f. 20
