lower right on stone: P.T. CVI; lower left in graphite: Cottonwoods in Canyon de Chelly; lower center in graphite: 15 Prints; lower right in graphite: Prentiis Taylor February 1963
- Rose, Ingrid, and Roderick S. Quiroz.. The Lithographs of Prentiss Taylor: A Catalogue Raisonné. Bronx, NY: Fordham University Press, 1996, p. 111, no. 106.