"The Essential Buyers Guide Datsun 240 Z" is one of the best sources of information on the 240 Z, 1969 to 1973. Attached are scans of the front and back covers. If you own a 240 Z or looking to purchase one, the back cover tells you why you need this book. The book was on Amazon for $22.36 plus tax. I have owned two 240 Z’s since December 1972, and found the book worth the purchase. The same publisher has around 120 Essential Buyers Guides for other classic cars and a few motorcycles.