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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Skinner, J. J. (Joshua John), - Sullivan, M. X. (Michael Xavier),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1914
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Manganese content  Soils
  2. By: Skinner, J. J. (Joshua John), - Reid, F. R. (Frederic Robertson)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: manganese  Manganese content  Plants, Effect of manganese on  Soils