
The industrial and conservation landscape of the Imperial Valley is clearly defined in this mid-century survey. The area is dominated by the southeastern shore of the Salton Sea, where unique geological activity is evidenced by several Mud Pots and extensive Carbon Dioxide Wells. This period captures a complex management of the desert environment, featuring the Salton Sea Natl Wildlife Refuge, the Wister Waterfowl Management Area, and the Imperial Waterfowl Management Area.
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4 editions found
1940 · Iris
USGS Topo · 1:62,500
1940 · Frink
USGS Topo · 1:62,500
1940 · Iris Pass
USGS Topo · 1:62,500
1944 · Calipatria
USGS Topo · 1:62,500
1944 · Frink
USGS Topo · 1:62,500
1945 · Iris Pass
USGS Topo · 1:62,500
1945 · Iris
USGS Topo · 1:62,500
1954 · Salton Sea
USGS Topo · 1:250,000
1955 · Salton Sea
USGS Topo · 1:250,000
1956 · Iris
USGS Topo · 1:24,000