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  1. By: Buttrick, John A. - Robinson, Donald F. - Bartlett, Robert. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Philadelphia, Pa. :Northeastern Forest Experiment Station,1946.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Buttrick, John A. - Robinson, Donald F. - Bartlett, Robert. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Philadelphia, Pa. :Northeastern Forest Experiment Station,1946.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Buttrick, John A. - Robinson, Donald F. - Bartlett, Robert. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Philadelphia, Pa. :Northeastern Forest Experiment Station,1946.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library