
The Rio Grande defines the international boundary between Texas and Mexico in this detailed survey of the Upper Rio Grande Valley. This landscape is characterized by a complex network of irrigation and drainage infrastructure essential to the border economy, including the Island Main Drain, Tornillo Canal, and Alamo Alto Canal. These systems support the fertile lands of San Elizario Island, where small settlements like Fabens and Tornillo flourished along the tracks of the Southern Pacific railroad.
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This is the sole edition of this map. No revisions or reprints were ever made.
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