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this held a day or two, and then began

(inside front cover, detail, watermark partially effaced)
George Homans Eldridge (1854-1905 *) and Ralph Arnold (1875-1961 *). The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts, Southern California. USGS Bulletin No. 309 (Series A, Economic Geology, 91; Series B, Descriptive Geology, 112), 1907
Stanford copy, no date of digitization
from which —

13 June 2015

curves; economic geology; folds; oil districts; north; south
G. H. Eldridge; R. Arnold