I would like to recommend some very useful books for basic survival for the hopefully unlikely position of having no resources left but knowledge of how to survive off the countryside :
The SAS Survival Handbook is pocket-purse sized so you can always have it with you. It is the Special Air Service's complete course in being prepared for any type of emergency. John 'Lofty' Wiseman presents real strategies for surviving in any type of situation, from accidents and...
More about this book
http://books.google.com/books?id=65-...um=1&ct=result
Medicinal Plants and Herbs from Peterson Gield Guides by Foster and Duke
Excellent guide to your area's plant life, specific medicinal uses illustrated with photos and descriptions of how to use.
A Field Guide to Edible Wild Plants: Eastern and central North America (Peterson Field Guides (R)) (Paperback)
by Lee Allen Peterson (Illustrator, Photographer), Roger Tory Peterson (Illustrator, Series Editor) "SYMBOLS are employed in the margins of the text to point out food uses and warn against poisonous plants..." (more)
http://www.amazon.com/Field-Guide-Ed...0905058&sr=8-2
Another Peterson Field Guide--they have them for each area