[D8035D], Report from Spring Valley Hydraulic Gold Co, January 1880
Reports on claims, operations & finances of Cherokee Flat Blue Gravel & Spring Valley Mining & Irrigation Cos.
https://edisondigital.rutgers.edu/document/D8035D
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 54