Reports of the market research firm (1923-) best known for its ratings of network radio and television programs. Consists primarily of Nielsen Radio Indexes, 1943-1957, and Nielsen Television Indexes, 1951-1953, which summarize and analyze Nielsen's bi-weekly reports and includes several types of audience measurements. Also includes miscellaneous reports on CBS sustaining programs, 1943, D-Day listening, 1944, and the purchasing habits of television viewers, 1957.