This superb set includes a 78rpm recording. I've inquired and gotten the following technical information for anyone who wishes to play the disc.
information from Rounder: "It's a standard wide groove 78 cut, usually played with a 2.5 mil stylus. It will play OK with a microgroove, and the smaller stylus won't hurt the record. It might just be a tad noisier since the stylus will travel deeper toward the bottom of the groove. Bill Nowlin"