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Kaiser, J.: Systematic indexing (1926)
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Mudge, I.G.: New guide to reference books (1923)
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Bliss, H.E.: ¬The organization of knowledge and the system of the sciences (1929)
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Jevons, W.S.: ¬The principles of science : a treatise on logic and scientific method (1924)
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Sayers, W.C.B.: ¬A manual of classification for librarians and bibliographers (1926)
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