I once scored a free copy of The Witches of Karres from a local book store which had a large chunk of the book missing - without actually picking up said book to check, I believe it's everything before page 38. I wasn't getting scammed though; I grabbed it because I already owned a copy of The Golden Age of Science Fiction which features the missing portion. Well, except for the title page, copyright information, endpage, and table of contents, and anything else before the story started, but who needs those?