This link to the University of Washington Press has a list of some wonderful nonfiction books. The following are some that interested me:
Dreaming of Sheep in Navajo Country by Marsha L. Weisiger
In Love with a Hillside Garden by Ann, Daniel, and Benjamin Streissguth
Greening Cities, Growing Communities: Learning from Seattle's Urban Community Gardens by Jeffrey Hou, Julie M. Johnson, and Laura J. Lawson.
They are currently offering 20% or more off on books--through Dec. 31, if you use the discount code mentioned at the bottom of this page.