Apologies if this is posted elsewhere. This is a collection of free PDFs which I came across. There are some very interesting titles there. Enjoy!
seasonedcitizenprepper.com
Survival Guides Download: 906 PDFs, Manuals & Emergency References – SCP Survival Resources
Access SCP Survival's full library of preparedness resources. Survival PDFs, food storage guides, gear lists, and more — practical tools for self-reliant living.