Power Records "A Story Of Dracula, The Wolfman And Frankenstein" (BR-508, 1975)
Kind of harkening back to the 1940's Universal "Monster Rallies", this all original story from Power Records (also released as "House of Terror" on Parade Records) seemed totally cool to me when I was a kid, and still comes off as one of the label's best efforts. Story-wise it's a fairly deft interweaving of the classic big three monsters, and the Neal Adams/ Dick Giordano artwork (some other nice examples of Adams' record cover work can be found here, and here) was a great compliment. From the liners:
"Frankenstein's monster, Count Dracula, and the Werewolf all meet under unusual and bizarre circumstances in this masterpiece of terror and suspense. Power Records is proud to present this magnificently illustrated original tale. Heightening the intense dramatic portrayal are sound effects and music that will keep you on the edge of your chair. This package is designed to be read and played -- and treasured for years to come."
Apropos of all that, I took pictures of the interior pages and included them in a folder with the audio; admittedly they're not hi-res scans so you probably won't be printing them out to be framed or anything, but it'll at least give a sense of the original Power Records "book and record" experience.
UPDATE: The Parade Records edition ("House of Terror", which also comes bundled with an extra LP of sound effects that I'm forgetting the original name of) seems to have been very recently available as a closeout item! While most of the stores I checked are coming up as "out of stock", a simple google search will still turn up several retailers listing the title, so maybe you can still get lucky.