just emptying out a box of books from a recent move and got to looking at Crossing the Frontier - Photographs of the Developing West, 1849 to the Present by Sandra Phillips et al

I saw the show and had bought the book then packed it away without much of a look. Taking it out again now after a few years, it's a quite wonderful and intriguing collection of landscape photographs of the West. (with a number of good essays). Well worth tracking down imo.

OOP, but a bit of info here:

http://www.chroniclebooks.com/site/catalog/index.php?main_page=pubs_product_book_info&products_id=336&store=books