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Hutchins, M.: Introduction to reference work (1944)
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Mann, M.: Introduction to cataloging and the classification of books (1943)
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Bliss, H.E.: ¬A bibliographic classification (1940-53)
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Zipf, G.K.: Human behavior and the principle of least effort (1949)
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Broadfield, A.: ¬The philosophy of classification (1946)
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Pettee, J.: Subject headings: the history and theory of the alphabetical subject approach to books (1946)
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Cunningham, E.R.: Classification for medical literature (1946)
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Savage, E.A.: Manual of book classification and display (1947)
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Shannon, C.E.; Weaver, W.: ¬The mathematical theory of communication (1949)
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