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Library of Congress Subject Headings
LCSH has been actively maintained since 1898 to catalog materials held at the Library of Congress. By virtue of cooperative cataloging other libraries around the United States... -
Chronicling America
Chronicling America provides access to information about historic newspapers and select digitized newspaper pages. 140,000 newspapers, 3.2 million pages. Issues The statistics... -
National Agricultural Library Thesaurus
The NAL Thesaurus is an online vocabulary tool of agricultural terms in English and Spanish and is cooperatively produced by the National Agricultural Library, USDA and the...
