DESERT RACING from Dirt Bike Magazine
In 1974, Dirt Bike made a fantastic publication, the Desert Racing Special.
It was loaded with action photos and 16 pages were in full color. It covered all types of desert racing, explained the differences, showed the best desert bikes of that era and had a whole bunch of great photos of actual racing. In addition, it showed you how to get in shape, how to ride various types of desert terrain and how to get good starts.
Copies of that Desert Racing special are rare nowadays and go for over $100 if you can find one. I scanned the copy in my library and am making it available in pdf format. Just pop it in your computer and every page is there. For $10 (postage included in the US) you can have your own Photo annual on disc. The best part is that you can print out each and every page.