The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

Las Cactáceas de MÉXICO - Bravo-Hollis, Helia, 1901 -2001 (UNAM [Imprenta universitaria], 1937)

Cacti - Griffiths, David, 1867 -1935 (U.S. Dept. of Agriculture, 1929)

Cacti - Griffiths, David, 1867 -1935 (U.S. Dept. of Agriculture, 1929)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1920)

Saguaroland Bulletin - Desert Botanical Garden (Ariz.) (Arizona Cactus and Native Flora Society, 1970)

Service and regulatory announcements - United States. Office of Experiment Stations. (U.S. G.P.O, 1936)

Trees and shrubs of Mexico - Standley, Paul Carpenter, 1884 -1963 (Govt. Print. Off, 1924)