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Nathan Marsh Pusey Library
42°22′23″N 71°6′55″W / 42.37306°N 71.11528°W / 42.37306; -71.11528
Location	Harvard University, Cambridge, Massachusetts, United States
Established	February 1976[1]
Architect	Hugh Stubbins and Associates
Branch of	Harvard Library

Nathan Marsh Pusey Library^[2][3] is an underground library at Harvard University. Announced in June 1971, it is named for Nathan Pusey, president of Harvard from 1953 to 1971. It contains the Harvard University Archives, and is the first library built with a halon-gas fire-extinguishing system.^[1].