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Daytime talk shows
http://talkshows.about.com/library/extras/bldaytimehistory.htm
About.com series of articles on daytime TV programming and the evolution of talk shows over the past 50 years.
Late-night talk shows
http://talkshows.about.com/entertainment/tv/talkshows/library/extras/bllate-nighthistory.htm
About.com series of articles on the history of late-night television from 1948 to the present.