Broadcasting and Cable Top 25 Station Groups, ranked yearly according to the percentage of US TV homes that they reach. In the Search for articles within this publication box, enter "top 25 station groups".
International Television and Video Almanac. Directory of television and video products and industry statistics, including Nielsen ratings (for top rated shows with their rating/market share numbers). Available at Annenberg Library Reference at call number HE8698 .I55 going back to 1987.
Encyclopedia of Television, 2nd edition, from the Museum of Broadcast Communications. Available at Annenberg Library Reference at call number PN1992.18 .E5 2004. 1st edition available online at the Museum of Broadcast Communications listing of Publications.
Television Bureau of Advertising - Facts & Figures page of statistics related to TV advertising, audience metrics, market profiles, and more.
Study of Media & Health: Television/Video - From the Kaiser Family Foundation, a series of reports on how media consumption affects the health and health education of Americans.
Trade organizations can be a great place to retrieve industry-specific statistics and data. Try: