“Old Time Radio” will find lots of results. archive.org/details/oldtimeradio is one place to start. “CBS Radio Workshop” is one show that is hard to define, and covered many topics. “Cavalcade of America” & “You Are There” show how they were telling history in previous decades.
Possible interesting comparisons: “Amos & Andy” vs “Lum & Abner” to see how African-Americans were portrayed vs. “hillbillies”. “Lux Radio Theater” as the first soap opera and why they chose so many stories with strong women (“For the Ladies” with Helen Hayes as the woman behind the man is one example).
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