The international border between the United States of America and Estados Unidos Mexicanos defines the upper margin of this survey, where the arid high desert of Southern California meets Mexico. The landscape is dominated by the steep topography surrounding Blue Angels Peak, a prominent landmark situated along the jagged transition between San Diego Co and Imperial Co. This specific map focus provides an unusual look at the remote mountainous divide where the two counties meet the international line. The drainage patterns and terrain contours illustrate the difficult geography of the In-Ko-Pah range area, where public land survey markers for t18s r8e and t18s r9e indicate the structured mapping of an otherwise sparsely settled wilderness.
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This is the sole edition of this map. No revisions or reprints were ever made.
1915 · El Centro
USGS Topo · 1:125,000
1931 · Carrizo
USGS Topo · 1:125,000
1939 · Jacumba
USGS Topo · 1:62,500
1940 · Coyote Wells
USGS Topo · 1:62,500
1942 · El Centro
USGS Topo · 1:250,000
1942 · Jacumba
USGS Topo · 1:62,500
1943 · Coyote Wells
USGS Topo · 1:62,500
1950 · San Diego
USGS Topo · 1:250,000
1954 · El Centro
USGS Topo · 1:250,000
1954 · San Diego
USGS Topo · 1:250,000