Interesting booklet, a present from Conjuring Arts Centre, about marks on cards. This is an original copy from the 1970s which describes how to mark cards and explains the "natural" markings in some decks. A tiny booklet, but a great reference on this kind of work. It doesn't describe HOW to mark cards, but how you can identify marks on the backs of cards.
The book is really tiny and it's stored inside Steve Forte's book on Poker (F00112).