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Bonn, G.S.: Relative usefulness of indexing and abstracting services (1950)
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- College and research libraries. 11(1950) no.3, S.207-210
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Warheit, I.A.: ¬A study of coordinate indexing as applied to U.S. Atomic Energy Commission Reports (1955)
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- College and research libraries. 16(1955) no.3, S.278-285