Frank Frazetta, Rough Work

Boingboing has some page shots of Frazetta's sketchbook book, which is still availalble in bookstores and quite reasonably priced.

Hardcover: 128 pages
Publisher: Spectrum Fantastic Art; 1st Hardcover Ed edition (September 28, 2007)
Language: English
ISBN-10: 1599290138
ISBN-13: 978-1599290133
Product Dimensions: 9.2 x 6.2 x 1 inches

Amazon has it at US$13.57 for example.