This is a partial list of books currently in print.
Himalayan Passage: Seven Months in the High Country of Tibet, Nepal, China, India, and Pakistan.
Grand Canyon, The Life and Times of a National Treasure
Thomas Moran, First Artist of Yellowstone
The Inn at Old Faithful
My Amazon author's page is here. It lists books in print, out of print, and available used.
Links to digital books (Kindle and iBooks) are located on pages under the "Books" tab. It's not complete, but I'm working on it.