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In 2004, 55 GPCAs were identified by biodiversity experts through research and a workshop co-organized by the CEC. Details of the initial selection process can be found in <\/SPAN><\/SPAN>North American Grassland Priority Conservation Areas: Technical Report and Documentation<\/SPAN><\/SPAN><\/A>, and the CEC publication <\/SPAN><\/SPAN>Grasslands: Toward a North American Conservation Strategy<\/SPAN><\/SPAN><\/A>.<\/SPAN><\/P>

In 2010, the GPCAs were updated by the Rocky Mountain Bird Observatory (RMBO) with data from the United States Geological Survey (USGS) on national and international land cover and elevations; habitat, species, priority areas and land cover data from states, universities and nongovernmental organizations; USGS Breeding Bird Surveys (BBS) and Christmas Bird Counts; Rocky Mountain Bird Observatory (RMBO) bird and vegetation surveys; Canadian Wildlife Service (CWS) bird surveys; and from individual researchers. The details for the revision of each GPCA can be found in <\/SPAN><\/SPAN>Assessment and Revisions of North American Grassland Priority Conservation Areas<\/SPAN><\/SPAN><\/A>.<\/SPAN><\/SPAN><\/P>

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