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  1. By: Alegria, James. - Scott, Charles Thomas, - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Radnor, Pa. :U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station,[1991]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Schreuder, Hans T. - Alegria, James. - Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)
    Publication info: Fort Collins, Colo. :USDA Forest Service, Rocky Mountain Forest and Range Experiment Station,[1995]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library