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Aven Nelson's field book dated 1925 to 1930, containing records 10163 through 10785. This book actually contains: 1925, 10163-10684; 1926, 10685-10785; 1927, 11001-11014; 1928, 10786-11000; 1929, 11021-11080; 1930, 11081-11376). There is a section in 1925 (10647-10671) that is collected by O. A. Beath. Observations were made in Arizona, New Mexico, Colorado, and Wyoming.
Note
Manuscript originals available at the University of Wyoming.
