Gratch, B.; Settel, B.; Atherton, P.: Characteristics of book indexes for subject retrieval in the humanities and social sciences (1978)
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- Indexer. 11(1978), S.14-22
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Bett, C.E.: ¬The Subject Access Project : a comparison with PRECIS (1979)
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- Indexer. 11(1979), S.145-148
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