Todsen's pennyroyal
Sivinski, R. 2009. TODSEN'S PENNYROYAL (Hedeoma todsenii) Progress Report to U.S. Fish & Wildlife Service, Region 2, Section 6, Segment 23. 30 October 2009.
Morrow, P. 2023. Todsen’s Pennyroyal monitoring was conducted at all 15 populations in the San Andres Mountains on White Sands Missile Range. No plants were collected, and no new populations were discovered.
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.