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  1. By: Downing, David J. - Alberta. Environmental Protection Services. - Alberta. Alberta Agriculture, Food, and Rural Development.
    Publication info: [Edmonton?], Timberline Forest Inventory Consultants, [1999]
    Holding Institution: University of Alberta Library
  2. By: Willoughby, Michael, - Sundquist, Karen M. - Downing, David J. - Alberta Land and Forest Services.
    Publication info: Edmonton, Alberta Environmental Protection, Lands and Forest Services, 1996
    Holding Institution: University of Alberta Library
  1. By: Downing, David J. - Bayer, Randall James - Vitt, Dale H. (Dale Hadley),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 105
    Issue: 3
    Date: 1991
    Page Range: 376--381
    Publication Info: Ottawa Ottawa Field-Naturalists' Club