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Blake Brothers Quarry (San Pablo), Point Richmond (The Point), Richmond, Contra Costa Co., California, USA
Latitude: 37°56'13"N
Longitude: 122°24'14"W
Longitude: 122°24'14"W
References
Davis, Fenelon Francis & J.W. Vernon (1951), Mines and mineral resources of Contra Costa County, California: California Journal of Mines and Geology (Report 47): 47(4): 585-586.California Journal of Mines and Geology (1958) (Report 54): 54(4): 550-551, 575, Pl. 5.
California Division of Mines and Geology (1990), Mines and mineral producers active in California (1988-89), California Department of Conservation, Division of Mines and Geology, Special Publication 103.
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New Locality Added: Lägern (Otelfingen; Boppelsen), Limmattal, Zürich, SwitzerlandFrom Richard Muster, 19th Jun 2013 20:38:43