Compiled by Herbert M. Baus - Definitely the best book to help solve crossword puzzles. The book is worth a fortune now. Approximately one million answer words. This book was published in 1981, and was the book to have when the internet was not around.
Keep looking on the internet for the book, sometimes you can find it.
This selection comes from an impressive vocabulary program I started playing around with a year or so ago. It's based on a huge dictionary of 150,000 words taken from all the 'big name' vocabulary courses and exams.