No idea if his personal collection was the file copies in the store;You couldn't actually physically touch them or look through them, as they were in all racks or shelving behind a counter and his desk.Like I said you had to look through this massive directory, pick out titles and he'd go and search through the racks to see if had doubles.Given he wouldn't sell a record unless he had 2 of them and from the pictures it looks to me like they are the same thing.
Occasionally you'd hit lucky but there were many records which were single copies and he wouldn't sell them.
There were other records in the front of the store that you could look through but these were pretty rough and 50c/$1 if I remember right.
Neil