In 1974, Bern Dibner donated one-quarter of the Burndy Library's then holdings to the Smithsonian Institution to form the nucleus of a research library in the history of science and technology, to be located in the decade-old National Museum of History and Technology (now called The National Museum of American History: Kenneth E. Behring Center). In 1976, the Smithsonian's Dibner Library of the History of Science and Technology was established, providing the Smithsonian Institution Libraries with its first rare book collection, containing many of the major works dating from the fifteenth to the early nineteenth centuries in the history of science and technology including engineering, transportation, chemistry, mathematics, physics, electricity and astronomy. The Smithsonian Dibner Library, then numbering 35,000 volumes, was reopened after construction in spring 2010, and is located in the National Museum of American History on the National Mall in Washington DC. The Smithsonian Institution Libraries have cataloged the books and manuscripts of the Dibner Library and entered the records into the international database OCLC and the Smithsonian's own online catalog, SIRIS.