Papers of S. P. Langley, 1896-1945.
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Langley, S. P. (Samuel Pierpont), 1834-1906
http://n2t.net/ark:/99166/w6xf1qpq (person)
Samuel Pierpont Langley (1834-1906) was the third Secretary of the Smithsonian Institution. He also served as the director of the Allegheny Observatory and a professory of astronomy at the Western University of Pennsylvania (now known as the University of Pittsburgh). While at the Smithsonian he founded the Smithsonian Astrophysical Observatory....
