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Gary Snyder is GOAT when it comes to outdoors-related literature. I'd especially recommend The Practice of the Wild and Riprap & Cold Mountain Poems by him, although he has many other books that are well worth reading.
Aside from Snyder, Edward Abbey & Robinson Jeffers are two other /out/ authors that I'd definitely recommend. Some deep ecologist writers (Paul Shepard, Pentti Linkola, etc.) are interesting, at least if you find the study of humanity's relationship with the wider world at a time of ecological crisis as something worth looking into.
Cheers on the peeps who have been posting Uncle Ted's manifesto. While most of you were probably drawn to his more conservative aspects, Kaczynki's writings on his experiences while living in Montana and witnessing the expansion of industrialism are nothing short of breathtaking. John Zerzan is an author who made a lot of similar conclusions to Ted, although his obvious 1960s leftist tendencies frequently crop up through his writings.
