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Correspondence, manuscripts, and subject files on most aspects of Pegram's career. Also, a large quantity of research notes made by Lucy J. Hayner (1898-1971), Professor Emeritus of Physics at Columbia University, who was writing a history of Columbia's Physics Dept., 1905-1954, can be found in folders throughout the collection.

Notes and correspondence of MacDuffie pertaining to the life of Szilard. The collection contains several letters written by Szilard, interviews by MacDuffie with Szilard, and two manuscripts concerning the early development of nuclear power. Also, a large number of clippings from magazines and newspapers describing Szilard's life and activities; and many of Szilard's publications.