I found this book in a used bookshop en route to Glacier National Park and brought it with me. I lucked out; I could not have had a better companion book for that trip. This is some of the best nature writing I've encountered - precise and scientific, but also incredibly beautiful. It's a relatively short book, but packed with information, including detailed descriptions of goat anatomy, habitat, and behavior (down to the average numbers of chews per second a goat takes while eating), as well as stories about the author's life on the mountains, a great chapter on other animals that share the goat's range, and thoughts on conservation and hunting regulations. It also contains some photographs (very good ones, though unfortunately black-and-white and not very well reproduced) and some useful drawings.
I love wildlife in general, but this book turned me into a mountain goat fan. It really helped me appreciate their beauty and uniqueness even more than I would have otherwise.