Question about PSG Instructional tapes from Duane Marrs Mus

[Louie Hallford]

I recently purchased 25 or 30 old instructional audio tapes that were distributed by Marrs.Instructons were by,Paul Franklin, George Edwards,Gene Oneal, Doug Jernigan and Bobby Hempker.

I wonder how many tapes were in the series, and if any other instructors were involved.

Some of the tapes are weak in quality as if the original owner might have lain them down above his pick-ups,causing the volume to be very low.

Are these tapes still available.If not,they should be as they are excellent as well as historic IMHO. I would love to replace the 2 or 3 bad tapes that I have.

Information anybody ?