Another good book is Bill Kit, about the MC ranch that Bill Kitterage assembled. You might also consider “A Natural History of Oregon's Lake Abert in the Northwest Great Basin Landscape” by Ron Larson.What a great trip, I enjoyed all the installments.
I was surprised to learn about the meaning behind the name of Picture Gorge after all the times I've driven through it!
I highly recommend the book "The Cattle Country of Peter French" if you can track down a copy, for some good reading on the country visited in the last post.