"Where there is no Doctor" and all related books are available for free download at: http://www.hesperian.org/publications_download.php .

The U.S. Air Force and U.S. Army Survival Manuals are good references and are available for free download at: http://www.scribd.com/ . I have checked out the ones I downloaded and they are genuine.

The "Merck Manual, Second Home Edition" is a good thing to have on your shelf if you are not a medical professional.

I would also recommend a good botany guide for whatever area you plan to survive in.