I just finished this book on my Kindle: “Porsche Legend: The Can-Am L&M Penske Porsche That Made Racing History”. Quite short, dirt-cheap, yet I found it to be a gem. It is totally specific to the L&M Penske 917/10 in the 1972 Can-Am season, and that’s why it is so brief. Nonetheless, it brings some great stories of what happened behind the scenes in the Penske camp. It is very light on the technical side, with almost nothing on stats or specs of the Penske cars. Even so, the book is a nice read, and you can basically finish it in one sitting.
With all that, I don’t think it will appeal to all gearheads, being so specific (and brief). Yet, for the price (less then 3 bucks!) you just can’t go wrong. So, if you have an interest in the 917/10 or Can-Am, it´s a nice read.