With “Everything But Gray: The Life of Audley Dean Nicols,” Thomas Duke and Gayle Boss have done a great service to the art world by shining a spotlight on Nicols, an unfairly overlooked pioneer of southwestern desert-landscape painting. With over 60 full-color plates of his canvases and a short, deeply engaging monograph on the artist’s life, this is a book that should be in every library in Arizona and Texas, and on every art lover’s shelf.