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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Billings, W. D. (William Dwight),
    Type: Article
    In: Great Basin naturalist memoirs
    Volume: 2
    Date: 1978
    Page Range: 105--117
    Publication Info: [Provo, Utah], Brigham Young University, 1976-1992
  2. By: Luken, James O - Billings, W. D. (William Dwight),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 100
    Issue: 1
    Date: 1986
    Page Range: 69--73
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Billings, W. D. (William Dwight), - Stekel, Peter - Cope, Edward A.,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 25
    Date: 1978
    Page Range: 174--176
    Publication Info: Berkeley, California Botanical Society,