The four color problem. 1926.

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The four color problem. 1926.

http://www.worldcat.org/oclc/56146658

1 v.

Columbia University in the City of New York, Columbia University Libraries

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SNAC Resource ID: 7720741

Columbia University in the City of New York, Columbia University Libraries

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Pogo, Alexander, 1893-

http://n2t.net/ark:/99166/w6kp8b1m (person)

Alexander Pogo was an astronomer and classical scholar born in Russia in 1893. He served as the librarian for the Mount Wilson Observatory located in Pasadena, California. From the description of Papers of Alexander Pogo, 1952-1959. (Huntington Library, Art Collections & Botanical Gardens). WorldCat record id: 462997178 ...