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  1. By: McDonald, Philip M. - Littrell, Edward E
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1976
    Page Range: 310--320
    Publication Info: Berkeley California Botanical Society
  2. By: Risebrough, Robert W. - Schlorff, Ronald W. - Bloom, Peter H. - Littrell, Edward E
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 3
    Date: 1989
    Page Range: 63--71
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-