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Geological Map of a part of the State of California Explored in 1853 by Lieut. R. S. Williamson U. S. Top. Engr. Prepared to accompany the report of William P. Blake Geologist of the Expedition. From Volume V of the Pacific Railroad Surveys, [1855].

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Geological Map of a part of the State of California Explored in 1853 by Lieut. R. S. Williamson

Geological Map of a part of the State of California Explored in 1853 by Lieut. R. S. Williamson U. S. Top. Engr. Prepared to accompany the report of William P. Blake Geologist of the Expedition.  From Volume V of the Pacific Railroad Surveys, [1855]. Delicate hand-coloring and patterns on this 22" x 16" lithographic map define the various geological regions of the state, primarily in the region from just northeast of San Francisco south to San Diego.

Geological Map of a part of the State of California Explored in 1853 by Lieut. R. S. Williamson
Courtesy Andrea Woolfolk, Elkhorn Slough Foundation.


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