Blue Angels Peak dominates the northern skyline of this borderlands survey along the international boundary between California and Baja California. The map covers a transition into the desert highlands south of the In-Ko-Pah Gorge, where the landscape is defined by a dense network of arid drainage patterns and high-elevation terrain. This 2012 survey serves as a precise record of the natural topography in a region where the environmental character remains the primary feature. The absence of developed settlements or infrastructure highlights the rugged isolation of this trans-border territory, focusing entirely on the complex hydrologic and elevation data of the Sierra de Juárez foothills.
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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