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Free-floating Subdivisions: An Alphabetical Index, 19th ed. Washington, D.C.: Library of Congress, 2007. (Online version Most recent information can be found in Cataloger's Desktop and in Classification Web.)
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Free-floating Subdivisions: An Alphabetical Index, 19th ed. Washington, D.C.: Library of Congress, 2007. (Online version Most recent information can be found in Cataloger's Desktop and in Classification Web.)
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