Category

National libraries in the United States

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Library of Congress

(de facto) national library of the United States of America

United States National Library of Medicine

medical library operated by the U.S. federal government

United States National Agricultural Library

agricultural research library serving as a national library of the United States, and the library of the U.S. Department of Agriculture

National Library of Education

U.S. national library

United States National Transportation Library

transportation research library serving as a national library of the United States, and the library of the U.S. Department of Transportation