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By "Arnold, Ralph, 1875-1961"
Geology and oil resources of the Santa Maria oil district, Santa Barbara County, California /
By: Arnold, Ralph, - Anderson, Robert van Vleck,
Publication info: Washington :Govt. Print. Off.,1907.
Contributed by: Smithsonian Libraries
BHL Collections: Smithsonian Libraries
Paleontology of the Coalinga district, Fesno and Kings counties, California.
By: Arnold, Ralph,
Publication info: WashingtonGovt. Print. Off.1909
Contributed by: Robarts - University of Toronto (archive.org)