United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class C Auxiliary sciences of history. Gale Research.
Chicago Style (17th ed.) CitationUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class C Auxiliary Sciences of History. Detroit: Gale Research, 1990.
MLA (9th ed.) CitationUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class C Auxiliary Sciences of History. Gale Research, 1990.
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