... My oldest is Kephart's "Camping and Woodcraft: A Handbook for Vacation Campers and for Travelers in the Wilderness." Not entirely what we think of as a survival manual, but very comprehensive. Originally published in 1917, my Grandfather had a copy when I as a kid, but an older cousin inherited that version. The copy I'm reading is the 7 printing from 2004.
Like Galton's book, Kephart's still-in-print classic grew through multiple editions, of which the 1917 version is the last.
I see no version at Project Gutenberg, alas, but the versions at Internet Archive seem clean, and have pretty much every format you could ask for: read online, or download as .pdf, epub, Kindle, or plaintext.
1st ed 1906: 321 pp:
https://archive.org/details/bookofcampingwoo00keph4th ed 1910: 331 pp,
https://archive.org/details/bookofcampingwoo01keph5th ed 1912: 331 pp,
https://archive.org/details/bookofcampingwoo02keph1917 version, 469 pp,
https://archive.org/details/campingwoodcraft00kephrich