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  1. By: Beckwith, L. C. - Ewan, Herbert G. (Herbert George), - Lake States Forest Experiment Station (Saint Paul, Minn.)
    Publication info: St. Paul, Minn, Lake States Forest Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1956
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: MacAloney, Harvey John, - Ewan, Herbert G. (Herbert George),
    Publication info: [St. Paul], Lake States Forest Experiment Station, 1964
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library