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Author
- Geological Survey (U.S.)3
- McConnell, R. G. (Richard George), 1857-19422
- Darton, Nelson Horatio, 1865-19481
- Faribault, E. R. (Eugène Rodolphe), 1860-1
- Richardson, G. B. (George Burr), 1872-19491
- Stose, George Willis, 1869-19601
- Todd, J. E. (James Edward), 1846-19221
- Willard, Daniel E. (Daniel Everett), 1862-1
- Williams, Henry Shaler, 1847-19181
