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Sears' list of subject headings (2018)
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Satija, M.P.: Enhancing the subject headings minting capacity of the Sears List of Subject Headings : some suggestions (2012)
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USMARC code list for geographic areas (1994)
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Library of Congress Subject Headings (2004)
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Dailey, J.E.: Subject headings (1980)
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