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  1. By: US-USSR Symposium on Air Pollution Effects on Vegetation Including Forest Ecosystems Corvallis, Or., etc.) - Noble, Reginald D. - Martin, Juri L. - Jensen, Keith F. - United States. Forest Service. - United States. Environmental Protection Agency.
    Publication info: Broomall, PA, Northeastern Forest Experiment Station, [1989?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Jensen, Keith F.
    Publication info: Upper Darby, Pa, 1969
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Jensen, Keith F.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 2
    Date: 1998
    Page Range: 382--383
    Publication Info: Ottawa Ottawa Field-Naturalists' Club