Doug Peacock,
Grizzly Years.
Peacock returned from Viet Nam and sought refuge and healing in the wilderness of American West, becoming an advocate for grizzlies. He is still working hard as a wildlife activist in the Yaak and Libby.
He served as lookout in Scalplock, possibly wrote part of the book there (I don't remember). Several bear encounters he recorded took place in Glacier.
Edward Abbey was posted to Numa Lookout, in the North Fork, and wrote
The Monkeywrench Gang there.
Lots of books about Glacier, as attested by my overflowing bookshelves.
Montana Historical Society produces and sells many interesting books on Glacier. Just looking over its website now, I am reminded of
View with a Room: Glacier's Historic Hotels and Chalets. I read most of it during a stay at Sperry Chalet; it was among the books stocked by the chalet.
The Montana Historical Society used to have a store by or in West Glacier Amtrak Station.
https://app.mt.gov/shop/mhsstore/glacier-park?orderby=6