One of my sisters sent me an Amazon.com certificate, for my birthday last week, and I ordered a few more knot books to add to my slowly growing knot reference library.
They arrived today and all have some different things in them along with similar ones with different perspectives.
The Marlinspike Sailor
The Morrow Guide to Knots
Des Pawson's Knot Craft
Fisherman's Ultimate Knot Guide (Cards)