Agreed Ian. The Clausager book was the first I ever bought on Le Mans. In fact, I think I have a second copy somewhere. I picked it up for pennies on Ebay thinking 'I'll make a few bob on that', only to find out that it really doesn't seem to have that much second hand value....
Edit.
I mean - just take a look at this......!
https://www.ebay.co.uk/itm/Le-Mans-b....c100706.m4781