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1. Colorado Block Groups 2002
2002. Geographic Data Technology, Inc. (GDT). Colorado Block Groups represents the U.S. Census block groups of Colorado. Environmental Systems Research Institute, Inc. (ESRI).
2. Colorado Tracts 2002
2002. Geographic Data Technology, Inc. (GDT). Colorado Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Colorado. Environmental Systems Research Institute, Inc. (ESRI).