Echinocereus fendleri var. kuenzleri
Fragua, S. (2001) Sensitive Plant Site Report, Population Site Report, Lincoln National Forest, Field Notes. Guadalupe Ranger District, Lincoln National Forest, USFS. 4 p.
Worthington, R. 2000. Inventory of the Flora of the New Mexico Portion of the Guadalupe Mountains, Otero and Eddy Counties, New Mexico, Working Second Draft. USFS.
Unknown, (1992). Oil and Gas Lease Survey, 1992. Map of known Kuenzler Cactus populations. Guadalupe RD, Lincoln NF. USFS
Unknown. 2014. Unpublished map with survey areas for multiple years, mostly concerning Echinocereus fendleri var. kuenzleri.
Fragua, S. 2014. Unpublished map for several surveys, mostly concerning Echinocereus fendleri var. kuenzleri
Fragua, S. 2004. Unpublished map of survey locations, moslty concerning Echinocereus fendleri var. kuenzleri
Fragua, S. 2003. Unpublished map of survey sites, mostly concerning Echinocereus fendleri var. kuenzleri.
Sharpe, M. (1997). Three specimen photos including section locations. Guadalupe RD, Lincoln NF, USFS,
Kahrs, D. 2014. Kuenzler's Hedghog Cactus locations from project area surveys. Environmental Planning Group, LLC.
Worthington, R.D. (1999) Summary Report, Survey for Kuenzler's Cactus, Echinocereus fendleri (Engelm.) Engelm. ex Rumpler var. kuenzleri (Castetter, Pierce & Schwerin) Benson in the Guadalupe Mountains, Lincoln National Forest. USFS. 134 p.