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  1. By: Sala, Anna. - Callaway, Ragan M. (Ragan Morrison), - United States. Forest Service.
    Publication info: [Missoula, MT.], [USDA Forest Service], [2001]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Pennings, Steven C. - Callaway, Ragan M. (Ragan Morrison),
    Type: Article
    In: Crossosoma
    Volume: 17
    Issue: 6
    Date: 1991-12
    Page Range: 1--9
    Publication Info: Claremont, CA, Southern California Botanists, Rancho Santa Ana Botanic Garden,
  2. By: Callaway, Ragan M. (Ragan Morrison), - D'antonio, Carla M
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 38
    Date: 1991
    Page Range: 158--169
    Publication Info: Berkeley, California Botanical Society,