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- ebrary, Inc25
- Geological Survey (U.S.)24
- Project Muse21
- Minnesota Geological Survey19
- Grout, Frank F. (Frank Fitch), 1880-195811
- University of Minnesota11
- Geological and Natural History Survey of Minnesota10
- Schwartz, George M. (George Melvin), 1892-198010
- Janssen, Robert B.9
- Minnesota Ornithologists' Union8
- University of Minnesota. Museum of Natural History7
- Butters, F. K. (Frederic King), 1878-19456
- Eddy, Samuel, 1897-19726
- Underhill, James Campbell6
- Winchell, N. H. (Newton Horace), 1839-19146
- Ahlgren, C. E. (Clifford Elmer), 1922-5
- Ahlgren, Isabel5
- Coffin, Barbara5
- Morey, G. B.5
- Morley, Thomas, 1917-5