1944 Map of Morgan Valley
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1944 Map of Morgan Valley

USGS Topo · Published 1944

About this map

Mining operations and isolated cattle ranches define the character of this 1940s landscape where Lake, Napa, and Yolo counties converge. The rugged interior is dominated by the Blue Ridge and Rocky Ridge, with the settlement of Knoxville serving as a central point for the surrounding industrial activity. Extensive cinnabar or mercury mining is evident through the presence of the Reid Mine, Harrison Mine, Manhattan Mine, and the Red Elephant Mine, reflecting the region's importance to wartime mineral production.


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Map Details

Date Portrayed1944
Date Published1944
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:62,500
Physical Dimensions16.6 x 20.8 inches

Editions of this 1944 Morgan Valley Map


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Source Details

CopyrightPublic Domain