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Creator
- Boyle, William F. Jr. 7
- Brown, James D. 7
- Bureau of Reclamation 7
- Byther, Harry S. 7
- Covington, Dwight A. 7
- Culter, Glynn R. 7
- Eck, William 7
- Frincke, Martin C. 7
- Hein, Eldor W. 7
- Hofman, Gotfried J. 7
- Johnson, Wilbur H. 7
- Lawton, Robert G. 7
- Newell, Lewis M. 7
- Nitta, William S. 7
- O'Leary, James E. 7
- Pritchard, Newton C. 7
- Soper, J. Frank 7
- United States. Department of the Interior 7
- Wilson, Bert f. 7