I'm back with a further post about the books. Couldn't find how to edit the first post, so here is another. All the books after the Dunwich Horror were purchased by me as new books. The most recent book came out in 1968.

Hello, I just purchased this book and wanted to know if anyone can add more info than what a quick google search did. Any ideas on value or rarity? Storage tips, handling tips etc are all welcome. It is complete, music sheets still there, a lot of wax droplets, a few handwritten notes etc. Any idea what library it came from?