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Mudge, I.G.: New guide to reference books (1923)
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Hertley, R.V.L.: Transmission of information (1928)
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Bliss, H.E.: ¬The organization of knowledge and the system of the sciences (1929)
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Kaiser, J.: Systematic indexing (1926)
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Jevons, W.S.: ¬The principles of science : a treatise on logic and scientific method (1924)
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Fellows, D.: Library of Congress Classification vs. decimal classification (1925)
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Lotka, A.J.: ¬The frequency distribution of scientific productivity (1926)
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Below, E.: ¬Das Schlagwortregister zum Fachkatalog (1921)
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Sayers, W.C.B.: ¬A manual of classification for librarians and bibliographers (1926)
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