What an amazing Black Sabbath post. Many thanks. Here is some info. I found out about the shows:
Civic Arena Pittsburgh 8th December 1976 FM Source: (From “British Biscuit” FM Broadcast and WAR PIGS IN PENNSYLVANIA bootleg): Symptom Of The Universe, War Pigs, Gypsy, Children Of The Grave.
There are two sources for this show. The first is an excellent FM tape that was recorded for the King Biscuit Flower Hour
(and British Biscuit) and an incomplete VG audience recording (approximately 80 minutes).
Civic Arena Pittsburgh 2nd September 1978 Original FM Broadcast: Snowblind, Black Sabbath, Iron Man, Paranoid
Radio Broadcasts: BRITISH BISCUIT (1978 D.I.R.): This is the best source available, but probably not so easy to find. This was distributed to radio stations on reel to reel. The original broadcast date was 9/17/78 and also included a set from Robin Trower
This info came from the sabbathlive.com website.