As a serious collector of vintage vinyl, your post allmost made me cry. (:<
you have no idea...imagine having the name of a song on your mind, and being able to find it in a card catalog, and then go to the corresponding stack & pull out the wax. AFRTS pressed their own vinyl for several decades, and that's where this library came from.
The lost includes a nearly complete collection of "The King Biscuit Flour Hour", all of those great live shows that the FM stations had late at night, when the DJ's were "out of the studio", and thousands more...still makes me sad when I think about it.