The two that really stick in my mind are To Build a Fire (I think it's a short story), and another one who's title escapes me, but he was on a ship that got stuck in ice and had to walk out, came across a bird nest and popped the chicks in his mouth still alive because he was so hungry. In To Build a Fire he walked from one town in the Klondike to another and used spit to gage the temp. I think it was something like -30 spit cracked when it hit the ground, and -40 it crackled in the air? Freakin' nuts.
BUt, yeah, my first dogs name was Buck because of that book.