Magnetic observation of sunspots, 1917-1924
[by] George E. Hale [and] Seth B. Nicholson

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Item Link Original Source
Full view   University of Minnesota
Full view   The Ohio State University
Full view   pt.1 University of California
Full view   pt.1-2 Columbia University
Full view   v.2 University of Illinois at Urbana-Champaign
Full view   1917-24 parts 1, 2 University of California
Full view   1938 University of Michigan