Clues to help Senormac (and anyone else):
1. You can generally tell if a book is pre-UPC (1976 and before) and post-UPC (1976 and after) if there's a UPC box "gap" in the boxes you can guess. For example...the book above almost certainly a pre-1976 book, because there's no UPC box gap.
Not foolproof, but usually works.
2 The logo/title are blocked out, for obvious reasons. Sometimes, you can sorta kinda imagine the logo.
3. Creator names and cover text are usually blocked out. This is also a subtle hint.