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Author
- Barlow, Scott6
- Robert, J. A.3
- Butts, Charles, 1863-19462
- Cross, Whitman, 1854-19492
- Darton, Nelson Horatio, 1865-19482
- Fletcher, Hugh, 1848-19092
- Keith, Arthur2
- Adams, Frank Dawson, 1859-19421
- Adams, George I. (George Irving), 1870-19321
- Geological Survey (U. S.)1
- Hall, Charles M. (Charles Monroe), 1870-19031
- Jaggar, Thomas Augustus, 1871-19531
- Lindgren, Waldemar, 1860-19391
- McLean, T. S.1
- Stone, Ralph W. (Ralph Walter), 1876-19641
- Taff, Joseph Alexander, 1862-1
- Woolsey, Lester Hood, 1877-19611
