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Not really books per se, but Mountaineers Press also sells decks of playing cards with /out/ info on them.
There's a Freedom of the Hills deck with mountaineering/climbing tips on it.
There's also:
Don't Die Out There (basic survival)
Don't Drown Out There (water safety)
Don't Freeze Out There (winter survival)
Don't Get Lost Out There (orienteering and self-rescue)
Backcountry Cooking (50 recipes camping and backpacking)