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  1. 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 Institution Libraries
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  2. 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)
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