The Rio Grande serves as the defining geographical and political boundary on this 2016 survey, where the international border between the United States of America and Estados Unidos Mexicanos is clearly delineated. This specific quadrangle covers a section of the river where Cameron County, Texas meets the Mexican state of Tamaulipas. The map is notably sparse, focusing on the winding course of the river itself and the immediate riparian zone. This minimalist representation emphasizes the natural divide formed by the waterway before it reaches the Gulf of Mexico, providing a clear reference for the physical geography of the border during the mid-2010s.
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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