Physicist, professor at Yale University. Correspondence, writings, lecture notes and glass slides relating to Kovarik's work on radioactive materials. Included also are biographical materials gathered by Kovarik in connection with an article on Bertram B. Boltwood and papers issued by the Committee on Standards of Radioactivity (1938-1946) of which Kovarik was a member. Prominent among his correspondents are Niels Bohr, Marie S. Curie, Ernest Pollard and Luville T. Steadman.