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Footnote

Original in: Pettee, J.: The history and theory of the alphabetical subject approach to books. New York: Wilson 1946. S.22-25.

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Footnote

Original in: Information retrieval today: papers presented at an Institute conducted by the Library School and the Center for Continuation Study, University of Minnesota, Sept. 19-22, 1962. Ed. by Wesley Simonton. Minneapolis, Minn.: The Center, 1963. S.21-36.