As a point of interest and as a word of caution: There is no such thing as a "repeat" on radio's Gunsmoke. Now what I mean by this is that there were 57 scripts of Gunsmoke that were recycled and used again. But although the same script was used (with some slight editing at times) the broadcast was original with different cast members from the prior production. 
Besides this there were 7 scripts that were used three times each and what makes this "worse" is that in some instances the name of the episode was changed


Information on telling the difference between these shows can be found at

http://forums.oldradio.net/forum13.html&sid=a3e3967b6945f12eb2a7d6fe792bedbe


On this set "OTR-TNT Gunsmoke The Complete Set"  Using the information provided by this site, we have listened to all of these episodes and are satisfied that the proper episode is in the right place