Been reading a ton of Ed Abbey as well. I couldn't get through "monkey wrench gang" that quick either but his non-fiction is much better and has a lot of the same ideas, "desert solitare" is good. He is totally misogynist in his fiction, hot babes come out of nowhere to bone old outdoorsmen (coincidence?)
All Derrick Jensen books, partially through "Endgame"
Carlos Casteneda "art of dreaming" -60 punk points but has been interesting, I read it before sleep and remember dreams way better and vaguely control them.
Slavoj Zizek "in defense of lost causes" modern day philospher, sometimes i loose him, sometimes he compares 9/11 to star wars