Nickel, Douglas R. CARLETON WATKINS: The Art of Perception. Introduction by Maria Morris Hambourg; 228 pp., including 105 tritone and 20 duotone plates. 4to, cloth. San Francisco, Museum of Modern Art in association with New York, Abrams, 1999.
Carleton Watkins was perhaps the greatest American landscape photographer of the 19th century. His images of Yosemite, the Columbia River and other natural wonders were among the first to convey the grandeur of the American West to audiences around the world.

Palmquist, Peter E. CARLETON E. WATKINS: Photographs 1861-1874. 222 pages with 110 reproductions. 4to, cloth. San Francisco, Fraenkel Gallery / Bedford Arts Publishers, 1989.