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  1. Soil survey of the middle Gila Valley area, Arizona / by E.C. Eckmann, Mark Baldwin, and E.J. Carpenter.
    By: Eckmann, E. C. - Baldwin, Mark. - Carpenter, E. J. - United States.
    Publication info: Washington :Govt. Print. Office,1920.
    Contributed by: University of California Libraries (archive.org)
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  2. Soil survey of the Red Bluff area, California / by L.C. Holmes and E.C. Eckmann.
    By: Holmes, L. C. - Eckmann, E. C. - United States.
    Publication info: Washington :Govt. Print. Office,1912.
    Contributed by: University of California Libraries (archive.org)
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