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Table 2-A-1 Counties within the Study Area <br />State ounty <br />0 ora o on ezuma <br /> La Plata <br /> Archuleta <br />ew ewco an uan <br /> McKinley <br /> Rio Arriba <br />nzona pac e <br /> Navajo <br /> Coconino <br />a an uan <br />B. Delineation of the Economic Region <br />Defining the appropriate extent for an economic region is always problematic and of necessity <br />somewhat imprecise. Richardson (1969) suggests that three criteria define a regional economy: <br />homogeneity with respect to physical, social, or economic characteristics; polarization around <br />some urban place; policy-oriented or administrative coherence of the area. The 10-county region <br />delineated for this study satisfies those three criteria. <br />Physical Homo eg_ neity. Actions taken on behalf of the endangered fishes may affect <br />developments on the Animas and La Plata Rivers in Colorado, the San Juan River in New <br />Mexico and Utah, and the Navajo Reservoir. These rivers are a linked system, so any direct <br />impacts in one part of the system will have an effect elsewhere in the system: Thus, the physical <br />factors define the region. <br />Polarization. The economies of the tribal lands are linked to the economies of the surrounding <br />communities such as Farmington and Gallup in New Mexico, and Page in Arizona. This linkage <br /> <br />