In the film Into the Wild, Emile Hirsch keeps on reading a book at different times, such as night time. In some scenes, the cover of the book is slightly visible.
What was the book he was reading?
You can spot him reading a few different books:
and, of course,
In the movie You can also see the entire book collection is carrying (at about minute 20), featuring:
According to the Krakauer's book, "Supertramp" was also carrying:
Hope this helps.