I have been meaning to send you the following to add to your vast treasure trove of SHTF/Prepper related publications, but I’ll just post it here for all:
Internet Archive (Main Page): https://archive.org/
Medical/First Aid Publication: https://archive.org/search.php?query=medical+first+aid&page=5
Manual Library (Extensive): https://archive.org/details/manuals?&sort=-downloads&page=13
US Military Manual Collection: https://archive.org/details/military-manuals?&sort=-downloads&page=2
Firearms Manuals: https://archive.org/details/firearmsmanuals?&sort=titleSorter&page=2
OSS Documents & Publications: https://archive.org/details/office-strategic-services?&sort=-downloads&page=2
Archive.org is completely searchable, and contains files, documents, etc. from the web (Wayback Machine), books, video, audio, software and images.
I particularly enjoy the pdf ebooks on great historical leaders from the 19th Century. There are lots of ebooks on the American Civil War, for example.
BTW, Archive.org is free (although they would like a donation). I have found that for me pdf files are the most easily read formats with the least optical character recognition (OCR) issues.
Finally, I almost forgot, not all documents are “yours to keep.” Some ebooks are “on loan” for about 2 weeks, and may even have a waiting period to get them.
I’m certainly not an expert on using Internet Archive, but the site has some “incredibly good” material.
If our fellow Freepers find a “stash” of information they like, why not share it with the rest of us.
Thank you. I will add these to my SHTF link list, also on the site.