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  1. By: Bartos, Robert. - Olsen, P - Olsen, J
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 3
    Date: 1989
    Page Range: 117--120
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Olsen, J
    Type: Article
    In: Phytologia
    Volume: 68
    Date: 1990
    Page Range: 137--137
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  3. By: Olsen, J - Olsen, P
    Type: Article
    In: Raptor research
    Volume: 15
    Issue: 2
    Date: 1981
    Page Range: 53--57
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  4. By: Olsen, J
    Type: Article
    In: Phytologia
    Volume: 67
    Date: 1989
    Page Range: 107--108
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  5. By: Olsen, J - Olsen, P
    Type: Article
    In: Raptor research
    Volume: 14
    Issue: 1
    Date: 1980
    Page Range: 10--12
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  6. By: Olsen, J
    Type: Article
    In: Rhodora
    Volume: 81
    Date: 1979
    Page Range: 449--501
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  7. By: Olsen, J
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 1
    Date: 1986
    Page Range: 41--41
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]