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Vizine-Goetz, D.: Subject headings for everyone : popular Library of Congress Subject Headings with Dewey numers (1998)
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Dumais, S.T.: Latent semantic analysis (2003)
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Dailey, J.E.: Subject headings (1980)
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USMARC code list for geographic areas (1994)
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Brickley, D.: Classification, collaboration and the Web of data (2011)
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