Bibliography and Citations
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Ponderosa pine the species and its management. September 29 - October 1, 1987.
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2002. North American Bumble Bee Species Conservation Planning Workshop final report. North American Bumble Bee Species Conservation Strategy Workshop. 9–12 Nov 2010; St. Louis Zoo, St. Louis (MO): International Union for Conservation of Nature (IUCN)/Species Survival Commission (SSC) Conservation Breeding Specialist Group. Available from http://www.cbsg.org/sites/cbsg.org/files/documents/bumble_bee_conservation_2010.pdf
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1890. A new map of the ecosystem regions of the United States. FWS/OBS - 78/76.
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