David Litfin's recent post on this show looks right. My reel copy of Peter Abram's that I made in 1974 is missing in action, but I do remember it being considerably longer than the 31 minutes listed here at Deadlists. I never transferred this show to CD, because it is missing. Therefore, what circulates would originate from reel or cassette copies made back in the '70s.
I know where a Maxell 7 1/2 ips reel copy of mine is and am trying to retrieve it currently. It was made way back when and has been packed away in a friend's basement. It was copied on a Revox, so it should show little degradation. When I get it, I'll get it out.