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  1. By: Waggaman, William H., - Wagner, Cary Richard, - Gardiner, R. F. (Robert Franklin),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1918
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Phosphate rock  Phosphatic fertilizers
  2. By: Penrose, R. A. F. (Richard Alexander Fullerton), - Geological Survey (U.S.)
    Publication info: Washington Govt. Print. Off 1888
    Holding Institution: Clemson University Libraries
    Subjects: Phosphate rock  
  3. By: Waggaman, William H., - Fry, William H. (William Henry),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Phosphate rock  Phosphatic fertilizer industry