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  1. By: Thorne, Harry W. - Stone, Robert N. - Lake States Forest Experiment Station (Saint Paul, Minn.)
    Publication info: St. Paul, Minn, Lake States Forest Experiment Station, [1959]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Stone, Robert N. - Thorne, Harry W. - Lake States Forest Experiment Station (Saint Paul, Minn.)
    Publication info: St. Paul, Minn, Lake States Forest Experiment Station, 1959
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Spencer, John S. - Thorne, Harry W. - North Central Forest Experiment Station (Saint Paul, Minn.)
    Publication info: [St. Paul], North Central Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1972
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Stone, Robert N. - Thorne, Harry W. - Lake States Forest Experiment Station (Saint Paul, Minn.) - Wisconsin. Conservation Department.
    Publication info: Saint Paul, Minn, Lake States Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1961
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library