I was wondering if anybody has checked this out for material that is older?
http://www.gutenberg.org/wiki/Main_Page

What Project Gutenberg does is archive books which are out of print and that the copyrights are expired on.
They then make them available for free downloading.

An example in the camping section is this one
HOW TO CAMP OUT (1877)

http://www.gutenberg.org/files/17575/17575-h/17575-h.htm

Or maybe
Foods That Will Win The War And How To Cook Them (1918)

http://www.gutenberg.org/files/15464/15464-h/15464-h.htm

They have a lot of books in their archive. Some of them might be interesting as references or maybe just to read.
"Maw's Vacation
The Story of a Human Being in the Yellowstone"
has some really funny bits in it.
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May set off to explore without any sense of direction or how to return.