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Studwell, W.E.: Library of Congress Subject Heading period subdivisions for Southeast Asia : some proposed additions (1982)
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Studwell, W.E.; Hamilton, D.A.: Library of Congress Subject Heading period subdivisions for the Soviet Union : some proposed additions (1986)
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Studwell, W.E.; Hamilton, D.A.: Library of Congress Subject Heading period subdivisions for Eastern Europe excluding the Soviet Union : some proposed additions (1985)
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Drabenstott, K.M.: Period subdivisions in the Library of Congress Subject Headings system : some thoughts and recommendations for the future (1992)
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