Lindgren, W.; et al. [MAP] Geological Map of the Nevada City and Grass Valley Mining Districts, Nevada Co., California (1896). New York: J. Ottmann Lith. Co., (1896). 
19 1/2 x 17 3/4 inches, a beautiful and unusual color map showing the geology of this region, suitable for framing. Very good.
Extracted from the Seventeenth Annual Report, U. S. Geological Survey.