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County map of California by S. Augustus Mitchell, Jr.
Scale: 60 miles to 1 inch
Charter of the Grass Valley Gold Mining Company, : organized July 25, 1851, under the general incorporation act of California. Together with extracts from the law, and various documents illustrating the business of quartz mining..
Includes an "Appendix" giving an overview of the geology of California’s gold regions, and extracts from the company’s first annual report.