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This guide provides an introduction to research on radio, including finding radio broadcasts and archives as well as publications and research about radio such as articles, books, statistics, ratings, and legislation.
Ratings Analysis: The Theory and Practice of Audience Research provides a look at the ratings industry and analysis processes. Coverage describes audience research data and summarizes the history of audience measurement, the research methods most often used, and the kinds of ratings research products available.
The graphic design may look out of date, but the worldradiohistory.com website contains the PDFs of some essential ratings reports in radio history, including the Cooperative Analysis of Broadcasting (CAB) from 1935-1946, the Hooper ratings from 1945-1964, and the Arbitron ratings from 1965-1991.