El Dorado County

El Dorado County – List of Stone Quarries
El Dorado County and the California Slate Industry (up to 1906) – Excerpts from Slate Deposits and Slate Industry of the United States, Bulletin No. 275, by T. Nelson Dale with sections by E. C. Eckel, W. F. Hillerbrand, and A. T. Coons, “Slate Deposits and Industry of the United States” - California, by Edwin C. Eckel, pp. 56-59, Department of the Interior, United States Geological Survey, Washington: Government Printing Office, 1906.
El Dorado County Slate Industry (through 1914) – Excerpts from Slate in the United States, Bulletin 586, by T. Nelson Dale and Others, United States Geological Survey, Washington: Government Printing Office, 1914)
El Dorado 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 III. The Counties of El Dorado, Placer, Sacramento, Yuba, California State Mining Bureau, 1919.
El Dorado, County, California, Mineral Resources & Introduction to the El Dorado County Area of California (circa 1915) – Excerpt from Sacramento Valley and Foothill Counties of California: An Illustrated Description of all the Counties Embraced in this Richly productive Geographical Subdivision of the Golden State, compiled and edited by Emmett Phillips and John H. Miller, Published under the direction of The Sacramento Valley Exposition, J. A. Filcher, Director-in Chief, January, 1915.
El Dorado County Mineral Industry (circa 1919) – Excerpt from California Mineral Production for 1919, Bulletin No. 88, by Walter W. Bradley, California State Mining Bureau, 1920.
El Dorado County Limestone Industry and Limestone Deposits (through 1947) – Excerpts from "Limestone in California," by Clarence A. Logan, California Journal of Mines and Geology, Vol. 43, No. 3, July 1947, California Division of Mines, San Francisco, California.
"The Cool-Cave Valley Limestone Deposits, El Dorado and Placer Counties, California (circa 1954)" by William B. Clark, Junior Mining Geologist, California Journal of Mines and Geology, Vol. 50, Nos. 3 and 4, July-October 1954, California State Mining Bureau, pp. 439-466.
El Dorado County Dimension Stone, Dolomite, Limestone, Slate, and Soapstone (historical account leading up to circa 1956) – Excerpts from "Mines and Mineral Resources of El Dorado County, California," California Journal of Mines and Geology, Vol. 52, No. 4, October 1956, California Division of Mines.

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