Todsen's pennyroyal
Ulaszek, E. F. 1994. Todsen's pennyroyal (Hedeoma todsenii -R.S. Irving) recovery plan, revision 1. Draft report prepared for R-2 USFWS, Albuquerque, NM. 26 pp.
Taylor, J. 2001. Email letter to Teri Neville from Rob Taylor (WSMR) regarding Hedeoma todsenii locations and potential habitat modeling. . 3 p.
Hartsough, M. 2018. Todsen's pennyroyal survey data from WSMR.
White Sands Missile Range and New Mexico Natural Heritage Program. 2001. White Sands Missile Range Integrated Natural Resources Management Plan (INRMP). . 469 p.
Todsen, Thomas K. 1990. T and E survey of the Oscura Mountains. 4 August 1990.
Oliva, Jon Paul. 1999. A preliminary habitat analysis using GIS and geospatial imagery: potential distribution of Hedeoma todsenii, a rare endangered plant. . 2 p.
Irving, Dr. Robert S. 1985. Todsen's Pennyroyal (Hedeoma todsenii R.S. Irving) Recovery Plan. U.S. Fish and Wildlife Service, Albuquerque, New Mexico. March 1985. 30 pp.
Irving, R.S. 1980. Status report on Hedeoma todsenii. U.S. Fish and Wildlife Service, Albuquerque, New Mexico.. 11 p.
Taylor, R. V. 2001. Endangered species management plan for Todsen's pennyroyal at White Sands Missile Range, New Mexico. White Sands Missle Range, Division of Environmental Stewardship.. 63 p.
Taylor, R. V. 2003. A botanical rarity on the range. Submitted to White Sands Missile Ranger Newspaper. .