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  1. By: Filip, Stanley M. - Leak, William B. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Upper Darby, Pa, Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1962
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Leak, William B. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: [Broomall, Pa.?], U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1985
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Leak, William B.
    Publication info: Upper Darby, Pa, Northern Forest Experiment Station, 1958
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Leak, William B. - Riddle, Jane R. - Collins, Marilyn. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: [Broomall, Pa.], Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, [1979]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library