Charles Martel (born Karl David Hanke, March 5, 1860, in Zurich, Switzerland – May 15, 1945) was an American librarian responsible for the creation of the Library of Congress Classification; he is often considered to be one of the most influential librarians in American library history.

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Not who you're looking for? Others named Charles Martel: Frankish military and political leader (c. 688–741)

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