Collection includes several folders of correspondence (bulk dates 1964-1967) between Cranberg and staff members of the American Physical Society (APS) and the American Institute of Physics concerning his objections over revisions made in the APS constitution in 1966 and his own proposals which would have amended the Society's objectives to allow it to become a regulatory organization concerned with the ethical practices of the physics community.

Other correspondence topics include Cranberg's publication arrangements, especially for his many letters to the editor of Physics Today; the nomination of Edward G. Pickels for the National Medal of Science based on his contributions to the field of ultracentrifugation and supporting background material (1933-1992); correspondence from Cranberg and A. J. Zink to National Science Foundation concerning Zink's complaints regarding the manufacture of ultracentrifuges by Jesse W. Beams at the University of Virginia in the 1960s; the dismissal of James S. McCarthy from the University of Virginia in 2000; Oppenheimer's management of Los Alamos written in 2000. Also contains materials on Cranberg's "Reaction Study by Time-of-Flight," 1954, which discusses a method of observing and measuring the spectra of neutrons. Correspondents include: Luis W. Alvarez, Robert F. Bacher, Hans Bethe, Felix Bloch, Karl K. Darrow, R. Hobart Ellis, Maurice Goldhaber, Elmer Hutchisson, H. William Koch, Arthur L. Schawlow, Frederick Seitz, and Charles Townes.