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Author
- Geological Survey (U.S.)8
- Snyder, George L. (George Leonard), 1927-4
- Gualtieri, James Louis, 1924-2
- Weir, Gordon W. (Gordon Whitney), 1922-20112
- Campbell, Marius R. (Marius Robinson), 1858-19401
- Crowder, D. F. (Dwight Farnsworth), 1929-1
- Diller, J. S. (Joseph Silas), 1850-19281
- Haney, Donald C.1
- Meissner, Charles R.1
- O'Neill, J. Michael1
