https://archive.org/search.php?query=survival has many different books on the subject. Also has alot of books on anything just change your search query. All free. A suggestion I found helpful was to load up an E-reader with as many documents you think may be helpful to keep in your emergency kit. Battery life on an ereader is fairly good and without the extras of an phone or tablet the life will be much better before it needs to charge. Keep in a Faraday Bag so EMP cant fry it, you dont need a network connection to use it anyways.