See here:
https://www.amazon.ca/Comedy-Golden-Age-Radio-Spirits/dp/1570190437
Sixty of radio's greatest comedy episodes from 20 of the greatest comedy series are contained in this comprehensive collection. Three episodes are featured from each of 20 different series, including "The Jack Benny Program, Abbott & Costello, Amos n' Andy, The Bickersons, " and "The Charlie McCarthy Show". The library includes a full 30 hours of programming plus a 36-page booklet. October 1996 publication date. Available now. 20 cassettes. .