Correspondence, subject files, and other papers relating chiefly to Townes' career as a physicist at Bell Telephone Laboratories, Murray Hill, NJ; Columbia University, New York, NY; Massachusetts Institute of Technology, Cambridge, MA; and University of California, Berkeley, CA. Includes material concerning his invention of the maser in the 1950s and his work as a member of the President's Science Advisory Committee and with the US Department of Defense during the John F. Kennedy presidential administration. Also includes lectures, notebooks, printed material, photographs, and other papers. Addition to collection consisting of outgoing correspondence, 1985-1992; materials pertinent to Townes' involvement with Secretary of Energy Advisory Board, National Academy of Sciences, National Research Council, National Bureau of Standards, NRAO, Institute for Defense Analysis, Dept. of Energy, and Jet Propulsion Laboratory. Also includes Research Notebooks, 1948-1965; maser-laser history files and patents; writings, speeches, honors, awards, and trip files.