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1 <br />Table 2-A-1 Counties within the Studv Area <br /> <br /> <br /> <br />1 <br />11 <br /> <br />State County <br />Colorado Montezuma <br /> La Plata <br /> Archuleta <br />New Mexico San Juan <br /> McKinley <br /> Rio Arriba <br />Arizona Apache <br /> Navajo <br /> Coconino <br />Utah San Juan <br />B. Delineation of the Economic Region <br />J <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 />1 <br />Physical Homogeneity. 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 /> <br /> <br />7 <br />