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Bhattacharyya, G.: ¬A general theory of subject headings (1974)
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Bhattacharyya, G.: Project on study of subjects (1975)
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Bhattacharyya, G.: Fundamentals of subject indexing languages (1979)
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Bhattacharyya, G.: Chain procedure and structuring of a subject (1972)
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Fraser, C.: Mathematics in library and review classification systems : an historical overview (2020)
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Olson, H.A.: Hegel's epistemograph, classification, and Spivak's postcolonial reason (2010)
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