Tucson, AZ: Etherton Gallery, 2014. First edition. Hardcover. A collection of 85 images by Walker that illustrate his use of the Sabattier printing process in which light is used during the developing process to create unique prints. Walker only used this very challenging process for only 2 years and the results were spectacular. A very near fine copy in illustrated boards. No dust jacket as issued. Includes laid in price list. Uncommon.