The Rio Grande defines the landscape of this southern border region in 2019, where it forms the international boundary between the Usa and Estados Unidos Mexicanos. This specific map section focuses on a bend in the river southeast of the Cameron County interior, illustrating the path of the watercourse as it separates Texas from Tamaulipas. The lack of land-based features on the American side of this specific quadrangle emphasizes the undeveloped, rural nature of the riverbanks at this point in the twenty-first century. For those researching the geography of the international boundary, the sheet provides a precise record of the river's alignment and the demarcated line between the two nations.
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This is the sole edition of this map. No revisions or reprints were ever made.
1929 · Santa Maria
USGS Topo · 1:24,000
1929 · La Paloma
USGS Topo · 1:24,000
1930 · West Brownsville
USGS Topo · 1:24,000
1930 · Barreda
USGS Topo · 1:24,000
1936 · West Brownsville
USGS Topo · 1:31,680
1936 · Barreda
USGS Topo · 1:31,680
1936 · Santa Maria
USGS Topo · 1:31,680
1936 · La Paloma
USGS Topo · 1:31,680
1945 · Olmito
USGS Topo · 1:31,680
1953 · Brownsville
USGS Topo · 1:250,000