For building your digital library.
The "Great Books" list are a set of books which are regarded as the basis of higher learning across the centuries.
Many are available from the Gutenberg site (gutenberg.org)
This list contains over a hundred links from the 60 volume Great Books Library.
The list is NOT complete, but it is a good start and, I think, a necessary addition to the prepper library.
http://www.scifiwright.com/2012/06/the-great-books-online/Due to the wide range of URL's, a compendium download is NOT available. Plan on spending some time and bandwidth to collect all of these...
You might not read these yourself, but Post SHTF, they might (should) be a store of knowledge for future generations.