The Power Records of the 1970's.
I just got one I found CONAN THE BARBARIAN, number PR-31, published in 1976. This one was later reprinted as CONAN 116 in 1980, but the version in the record set is offset printing on nicer paper, so what the hell, the price was right so I went ahead and got the original version.
The only other two I have are BATMAN stories by Neal Adams, that were also reprinted in the BATMAN ILLUSTRATED BY NEAL ADAMS, VOL 3,in hardcover and trade paperback. Although the Batman ones are extensively redrawn in the hardcover reprint, so I'm glad to have the originals. Some of the more obscure Adams material. These are all comic book size.
There were some 12" X 12" size LP records too. I have a STAR TREK (1975, number 8158) that also has art by Adams, but only on the front and back cover.
Here's a list of the ones that have been indexed:
https://www.comics.org/series/name/book%20and%20record%20set/sort/alpha/
