When I discussed some of the more general sources of info and put together my E-Book Resource page, I generally listed some major repositories with the warning that you would need to explore those repositories to find the books and information that might interest you. But I thought I would periodically post more specific links to a collection, library, or specific titles that would be of interest to the prepper/survivalist.
The book is in PDF format, but you may find the following programs useful to view it on your computer or to convert to a different format: First is Calibre, which is a free-to-download e-book management program. What makes it useful is that it can read many different formats of e-books and can convert between different formats (e.g. from epub to MOBI) as long as there is no encryption, and allows you to organize files into useful libraries. Second, and more basic, is SumatraPDF which also allows you to view all sorts of e-book formats but without the ability to convert a file from one format to another.
Disclaimer: I'm not the author of any of the documents, applications or things linked above and cannot vouch for their accuracy or completeness--use them at your own risk. I am not responsible for the posting or offering of any of the documents or things in the collections and/or libraries and have no control over whether they are posted or taken down.