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Figure 1. Hydrologic map of western United States and Mexico showing endangered aquatic ecosyst <br />desert region: Cuatro Cienegas (COA), Gila River (NM, AZ, SON), Rio Grande (NM, TX, CHI, COP <br />(NM, TX), Railroad Valley (NV), Colorado River (CO, UT, NM, AZ, NV, CA, BCA, SON), Green <br />ranagat Valley (NV), Parras Basin (COA), La Media Luna (SLP), Ash Meadows (NV), Upper Whit <br />(NV), Rio Yaqui (AZ, CHI, SON) and Upper Klamath Basin (OR, CA). <br />ISSUE 1, 1985 ENDANGERED AQUATIC ECOSYSTEMS IN NORTH AMERICAN DES)