Ponencias /compiled by David R. Patton ... [et al.] - Fort Collims, Co. : USDA. Forest Service, 1986 - iii, 113 p. : gráfs. - General Technical Report ; R.M.-135 . - General Technical Report ; R.M.-135 . LCCN: 66100 Subjects--Topical Terms: Calabaza--México (Edo.)Candelilla.Flora desértica.Guayaba.Mezquite.Nopal.Oryzopsis hymenoides.Pastizales--Sonora. Dewey Class. No.: 581.9095 / R48