- Coahuila and Texas, 1821-1836 - - Historical index for the early political development of the region, including DeWitt Colony under Coahuila y Tejas, from Liberal Federalism to Centralist Dictatorship, 1824 Constitution and Colonization Laws.
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- Coahuila, Mexico- WorldGenWeb - - Volunteer project providing geneaology resources, including obituaries, background information on recordkeeping in the state, and links to maps and history.
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- Cuatro Cienegas de Carranza - - Information on this unique desert aquatic ecosystem, including organisms, habitat, conservation and tourism. [English/Spanish.
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- State of Coahuila - - Official state site, with information about tourism, investment and government. [English/Spanish.
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