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  1. By: Graber, Raymond E. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Upper Darby, Pa, U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1970
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Graber, Raymond E.
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 131--140
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],