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Scientific American, Vol. 26, No. 3 (1872) (1872)
leaf 3
34 Scientific American, ONDARRIES VeNs: | i, j | \ | Soll | iat THE ALLEGHENY OBSERVATORY.—{See next nage] © 1872 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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