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  1. By: Nietfeld, Marie T. (Marie Theresa), - Roy, Laurence D. - Alberta Environmental Centre.
    Publication info: Vegreville, Alta. :Alberta Environmental Centre,1993.
    Holding Institution: University of Alberta Libraries (archive.org)
  2. By: Rangen, Sheila A. (Sheila Anne), - Roy, Laurence D. - Alberta. Alberta Environmental Protection. - Alberta Research Council.
    Publication info: Vegreville, Alta. :Alberta Research Council ;June 1997.
    Holding Institution: University of Alberta Libraries (archive.org)