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  1. By: Heald, F D - Studhalter, R A
    Type: Article
    In: The Auk
    Volume: 32
    Date: 1915
    Page Range: 119--119
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  2. By: Studhalter, R A - Ruggles, A G
    Type: Article
    In: The Auk
    Volume: 33
    Date: 1916
    Page Range: 447--448
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  3. By: Studhalter, R A - Heald, F D
    Type: Article
    In: American journal of botany
    Volume: 2
    Issue: 4
    Date: 1915-04
    Page Range: 162--168
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  4. By: Heald, F D - Studhalter, R A
    Type: Article
    In: American journal of botany
    Volume: 2
    Issue: 9
    Date: 1915-11
    Page Range: 429--448
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-