Here are some free downloads of various books on knots and military manuals that you may find useful. You may want to consider downloading them to an older laptop and sticking it in a Faraday Bag. This will let you keep them handy, even in a worst-case scenario, without the expense of printing them.
Free military manuals
The post Free Manuals: Military Manuals & Books About Knot-Tying appeared first on Preparedness Advice.