Knowlton's cactus
Roth, D. 2019. Knowlton's Cactus (Pediocactus knowltonii) 2019 Summary Report. NM Energy, Minerals, & Natural Resources Department.
Ladyman, J.A.R. and Y. Chauvin. 1998. Survey for sensitive plant species on the El Malpais National Conservation Area. Unpubl. report by New Mexico Natural Heritage Program for Bureau of Land Management, Albuquerque Field Office. 51 p.
Roth, D. 2013. Pediocactus knowltonii (Knowlton's Cactus), summary report. Submitted U.S. Fish and Wildlife Service, Section 6, Segment 27. 25.
Sivinski, R. 2004. Knowlton's Cactus (Pediocactus knowltonii): Progress Report. New Mexico Forestry Division; Santa Fe, New Mexico. 13 p.
Roth, D. 2012. Pediocactus knowltonii (Knowlton's cactus): 2012 status report. Santa Fe, NM: NM Energy, Minerals and Natural Resources Department - Forestry Division; Report E-9-26 to U.S. Fish and Wildlife Service. 25p.
Sivinski, R. 2006. Knowlton's Cactus (Pediocactus knowltonii): Progress Report for U.S. Fish and Wildlife Service Section 6, Segment 20.
Glenne, G. and E. Mayo. 2009. Field survey form for Knowlton cactus (Pediocactus knowltonii). 4 p.
Roth, D. 2016. Pediocactus knowltonii (Knowlton's Cactus): 2015 summary report, Section 6, segment 29. New Mexico Energy, Minerals, and Natural Resources Department, Forestry Division, Santa Fe, NM. 32 p.
Roth, D. 2015. Pediocactus knowltonii (Knowlton's Cactus) summary report, 2014. NM Energy, Minerals, and Natural Resources Department.
Roth, D. 2020. Pediocactus knowltonii (Knowlton’s Cactus) Summary Report (Section 6, Segment 34, 2020. EMNRD).