The international border between the United States of America Estados Unidos Mexicanos defines the northernmost section of this 2018 survey. Situated in the arid landscape south of Yuma, the map primarily illustrates the open desert terrain within the Sonoran region of Mexico. The boundary line, labeled in both English and Spanish, angles across the upper northeast corner, marking the geopolitical divide within the T12s R21w township grid. Aside from this primary international marker, the sheet is characterized by its isolation and the subtle natural drainage patterns that cross the desert floor.
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This is the sole edition of this map. No revisions or reprints were ever made.
1942 · Yuma
USGS Topo · 1:250,000
1954 · El Centro
USGS Topo · 1:250,000
1955 · El Centro
USGS Topo · 1:250,000
1958 · El Centro
USGS Topo · 1:250,000
1961 · El Centro
USGS Topo · 1:250,000
1964 · El Centro
USGS Topo · 1:250,000
1964 · South of Yuma
USGS Topo · 1:62,500
1965 · Vopoki Ridge
USGS Topo · 1:62,500
1980 · Tinajas Altas Mts
USGS Topo · 1:100,000
1982 · Tinajas Altas
USGS Topo · 1:125,000