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The Agassiz incident
Remembering Helen
The History of the Butterfly
Helen Fitch Parker
  Agassiz, Louis.  1851.  American Association for the Advancement of Science.  The incident referenced is recorded on page 348.  
  Anon.  1904.  Obituary Record of Graduates of Amherst College, for the Academical Year Ending June 29, 1904.  
  Grinnell, Josiah Bushnell, 1891.  Men and Events of Forty Years, Autobiographical Reminiscences of an active career from 1850 to 1890.  D. Lothrop Company, Boston.  
  Nelson, Henry A.  1907.  The Auburn Seminary Record.  Auburn Theological Seminary.  
  Parker, Helen F.  (as H.F.P.) 1836.  Rambles after Land Shells.  American Tract Society, Boston.  As accessed at the University of Florida Baldwin Library of Historical Children's fiction.  http://ufdc.ufl.edu/UF00003394/00001/4j.  
  Sargent, John F., Mary E. Sargent, and Abby L. Sargent.  1890.   Reading for the Young, A Classified and Annotated Catalog.  American Library Association Publishing Section. Boston.