1999
Sivinski, R. 1999. Kuenzler's cactus: Wildfire study Lincoln National Forest. . 4 p.
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Kuenzler's hedgehog cactus
Sivinski, R. 1999. Kuenzler's cactus: Wildfire study Lincoln National Forest. . 4 p.
Worthington, Richard. Survey for Kuenzler's Cactus, Echinocereus fendleri (Engelm.) ex Rumpler var. kuenzleri On Texas Hill, Guadalupe Mts, New Mexico. Southwestern Research and Professional Services, El Paso, TX. 5p.
Paul, Larry W. 2012. Guadalupe Ranger District, Lincoln National Forest. Maps pp. 1-13.
Baker, M. 2008. Botanical Survey 2008 Season - Kuenzler's cactus surveys. Guadalupe Ranger District, Lincoln National Forest. 19 p.
Muldavin, E., Y. Chauvin, and C. Reasner. 2017. Monitoring Kuenzler's Hedgehog Cactus (Echinocereus fendleri var. kuenzleri): 2015 Fort Stanton Surveys. Natural Heritage New Mexico, University of New Mexico. 22 p.
Bleakly, David. 2001. Echinocereus fendleri var. kuenzleri occurrences in the survey corridor along US-54, Lincoln County, New Mexico. Blue Earth Environmental, Santa Fe, New Mexico.. 1 p.
Barker, Linda M. 2002. Lincoln National Forest inventory completion report, sensitive plant survey field notes for Kuenzler's hedgehog. . 47 p.
Chauvin, Y.C., A. Kennedy, and K. Wild. 2001. Survey for Kuenzler's Hedgehog Cactus (Echinocereus fendleri var. kuenzleri). 29 p.
Chauvin, Yvonne. 1997. Field observation by Yvonne Chauvin, Natural Heritage New Mexico, for Echinocereus fendleri var kuenzleri. . 2 p.
Chauvin, Y., Muldavin, E., Varani, H. and H. Hulse. 2012. Excel spreadsheet of Kuenzler's cactus data collected for BLM project. Natural Heritage New Mexico.