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Author
- Geological Survey (U.S.)9
- Cater, Fred W. (Fred William), 1912-6
- Hackman, Robert J.2
- Baltz, Elmer Harold, 1927-1
- Burbank, W. S. (Wilbur Swett), 1898-19751
- Bush, Alfred Lerner, 1919-1
- Haynes, Donald D.1
- Johnson, Ross B., 1919-1
- Luedke, Robert George, 1927-1
- Purington, Chester Wells, b. 18711
- Williams, Paul L. (Paul Lincoln), 1932-1
