
El Cajon Valley and the surrounding San Diego back country appear here in a state of early transition, documented by surveyors A. P. Davis and Jeremiah Ahern. The most striking engineering feature is the San Diego Flume, a massive wooden water conduit winding across the hills and through several bores including the Lankersheim Tunnel and Los Coches Tunnel. This infrastructure was vital for the irrigation of the valley's growing agricultural industry.
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This is the sole edition of this map. No revisions or reprints were ever made.
1893 · El Cajon
USGS Topo · 1:62,500
1893 · Escondido
USGS Topo · 1:62,500
1901 · Escondido
USGS Topo · 1:62,500
1901 · San Luis Rey
USGS Topo · 1:125,000
1903 · Cuyamaca
USGS Topo · 1:125,000
1903 · La Jolla
USGS Topo · 1:62,500
1903 · Elcajon
USGS Topo · 1:62,500
1903 · Ramona
USGS Topo · 1:125,000
1904 · San Diego
USGS Topo · 1:62,500
1904 · Southern California Sheet No. 2
USGS Topo · 1:250,000