The Ashley Book of Knots is the "bible " of all knot tying , and it is out of print and hard to find. There is a PDF file, though, and it makes a great reference for those interested.
The file is 107 MB, which is too large to upload here, so I have it located at the moment on the 4Shared site.
Be aware it will be a long download, but it is worth it if you can get it.
EDIT: At least one download showed a corrupted file. I have re-downloaded and the file was intact at my end, so the source file is good. The problem is that it may run 4-5 hours to download, and that increases the vulnerability to interruption or corruption of the download.
Be sure to check, final download should be 104 MB. [107,000 KB]