Have been working for a while on a Knot Pamphlet that, perhaps inevitably, morphed into a 40+ Knot Booklet.
Thought folks here might like to have a look.
It is not specific to camping, but I think you will find several of the knots useful.
It is made available under the Creative Common License, so it is free, with the following conditions:
Attribution – Noncommercial – No Derivative Works.
If you like it, I would appreciate it if you said so.