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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... -
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... -
Open Library
About One web page for every book ever published. It's a lofty, but achievable, goal. To build it, we need hundreds of millions of book records, a brand new database...
