The Standardised War-Time Jeep, 1941-45 by John Farley. This is an excellent reference book that tries to show all of the variations of the MB and GPW throughout the war-time period. Mr. Farley does a pretty good job and the book is well worth owning. The book is still listed at Amazon.com but it is a ridiculously high price (hopefully, it is a typo!).
- ISBN-10: 0953447030
- ISBN-13: 978-0953447039
However, the book appears to be out of print as the price is $200 through third party sellers. Good luck in finding a copy!