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| | Ventura County |
 | | Ventura County Mines and Mineral Resources (circa 1915-1916) – Excerpts from Report XV of the State Mineralogist, Mines and Mineral Resources of Portions of California, Chapters of State Mineralogist’s Report Biennial Period 1915-1916, Part V. Monterey, San Benito, San Luis Obispo, Santa Barbara, Ventura counties, California State Mining Bureau, 1919. |
 | | Ventura County Mines and Mineral Resources (circa 1915-1916) – Excerpts from Report XV of the State Mineralogist, Mines and Mineral Resources of Portions of California, Chapters of State Mineralogist’s Report Biennial Period 1915-1916, Part V. Monterey, San Benito, San Luis Obispo, Santa Barbara, Ventura counties, California State Mining Bureau, 1919, pp. |
 | | “Ventura is the tenth county in the state in respect to the value of its mineral production for 1919, the exact figure being $3,017,074, as compared with the output for 1919, worth $2,186,311, the advance being due to petroleum. |
| cagenweb.com /quarries/states/ca/quarry_photo/ca-ventura_photos.html (4518 words) |
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