Attributes / relations provided by
♦ ¹Negron, Jose F. 1995. Cone and Seed Insects Associated with Piñon Pine. In: Shaw, Douglas W.; Aldon, Earl F.; LoSapio, Carol, technical coordinators. Desired future conditions for piñon- juniper ecosystems: Proceedings of the symposium; 1994 August 8-12; Flagstaff, AZ. Gen. Tech. Rep. RM-258. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station: 97-106.
♦ ²Thick-billed Parrot, BirdLife International (1992) Threatened Birds of the Americas. Cambridge, UK: BirdLife International.