The one I would love to find again was about making lanyards, it had an excellent collection of decorative knots but I lost it somewhere along the way.
There are plenty of books out there on knots, is there any particular book that you are looking for? I know my Dad had quite a few books on all kinds of topics and I know for sure he had a pretty old book on knots, if I find it over the weekend I will post the title on the forum.