The United States National Agricultural Library (NAL) is one of the world's largest agricultural research libraries, and serves as a national library of the United States and as the library of the United States Department of Agriculture. Located in Beltsville, Maryland, it is one of four national libraries of the United States (along with the Library of Congress, the National Library of Medicine, and the National Library of Education). It is also the coordinator for the Agriculture Network Information Center, a national network of state land-grant institutions and coordinator for the U.S. Department of Agriculture (USDA) field libraries.
NAL was established on May 15, 1862, by the signing of the Organic Act by Abraham Lincoln. It served as a departmental library until 1962, when the Secretary of Agriculture officially designated it as the National Agricultural Library. The first librarian, appointed in 1867, was Aaron B. Grosh, one of the founders of the National Grange of the Order of Patrons of Husbandry.
More information on the Wikipedia page