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  1. By: Zehngraff, Paul J. (Paul Johannes), - Gevorkiantz, S. R. - United States. Department of Agriculture. - Lake States Forest Experiment Station (Saint Paul, Minn.)
    Publication info: St. Paul, Minn, Lake States Forest Experiment Station, University Farm, 1948
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Zehngraff, Paul J. (Paul Johannes), - Lake States Forest Experiment Station (Saint Paul, Minn.)
    Publication info: St. Paul, Minn, Lake States Forest Experiment Station, 1947
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library