Thanks, Keith! I also wanted to post a link to a site that has streaming audio of Lux Radio Theater shows. I listenened to Red River and She Had a Yellow Ribbon there just last night. 
http://otrarchive.blogspot.com…07/lux-radio-theater.html
Scroll down and you'll come to a long list of the broadcasts from which to choose.
Red River is March 7, 1949 (listed as 03/07/49 #648) and She Wore a Yellow Ribbon is March 12, 1951 (listed as 03/12/51 #737).
