Escobaria sneedii var. leei
Ladyman, J.A.R., Y. Chauvin, and L. DeLay. 1998. Survey for Lee's pincushion cactus (Escobaria sneedii var. leei). Unpubl. report by New Mexico Natural Heritage Program for Bureau of Land Management, Carlsbad Field Office. 8 p. + maps.
Sharpe, M. (1997) Multiple Bundled Sensitive Plant Surveys, Lincoln National Forest, Field Notes. Lincoln Supervisor's Office, Lincoln National Forest, USFS. 74 p.
Sharpe, M. Rohrer, T. (1997) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Corypantha sneedii var. leei. Guadalupe RD, Lincoln NF, USFS. 6 p.
Sharpe, M. Rohrer, T. (1997) Sensitive Plant Site Report, Population Site Report, Lincoln Natioanl Forest, Field Notee.s Corypantha sneedii var. leei. Guadalupe RD,Lincoln NF, USFS. 6 p.
Rohrer, T. Sharpe, M. (1997) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Corypantha sneedii leei. Guadalupe RD, Lincoln NF, USFS. 3 p.
Rohrer, R. Sharpe, M. (1997) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Corypantha Sneedii leei. Guadalupe RD, Lincoln NF, USFS. 4 p.
Sharpe, M. Brewer, M. (1997) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Corypantha sneedii leei. Guadalupe RD, Lincoln NF, USFS. 4 p.
Sharpe, M. (1997) Inventory Completion Report, Sensitive Plant Survey, Lincoln National Forest, Aquilegia survey- Gilson's Spring. Guadalupe RD, Lincoln NF, USFS.
Van Devender, R., and R. Rondeau. 1992. The status of Sneed's pincushion cactus (Coryphantha sneedii var. sneedii) in Texas. Southwestern Field Biologists. Tuscon, Arizona. 20 p.
Tonne, P. 2002. Results of rare plant surveys on Carlsbad Caverns National Park. 23p. + appendices.