The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 67
ILL. No. 24. ORBICULAR DIORITE MINE, DEHESA, SAN DIEGO COUNTY—NEAR VIEWOF OUTCROP. have not been observed at the latter point. He says that not many ofthe orbicules are strictly orbicular, but that one of the finest is kidney-shaped, 4^ inches long and If inches wide. (See photograph in 17thAnnual…
Building stones · Portland cement · Clay · Mines and mineral resources
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