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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Holmes, L. C. - Eckmann, E. C. - United States. Bureau of Soils.
    Publication info: Washington, Govt. Print. Office, 1912
    Holding Institution: University of California Libraries
  2. By: Eckmann, E. C. - Baldwin, Mark. - Carpenter, E. J. (Eugene Johnson), - United States. Bureau of Soils. - United States. Department of Agriculture.
    Publication info: Washington, Govt. Print. Office, 1920
    Holding Institution: University of California Libraries