Ada Hayden

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Photograph of Miss. Ada Hayden, Ames, Iowa, Department of Botany, Sept. 1923
Photograph of Men Harvesting Onions, St. Ansgar, Mitchell County
Brassica nigra (Black mustard)
Letter from Louis Hermann Pammel to the Secretary of Board of Fellowships in Biological Sciences at the National Research Council, June 15, 1923
Letter from Ada Hayden to Louis Hermann Pammel, August 5, 1919
Letter from Louis Hermann Pammel to D. M. Hayden, January 29, 1910
Letter from Louis Hermann Pammel to Ada Hayden, February 9, 1910
Eupatorium (Boneset)
Letter from Ada Hayden to Louis Hermann Pammel, January 12, 1917
Bidens alba (Beggar ticks)
Letter from Ada Hayden to Louis Hermann Pammel, 18, 1919
Echinacea purpurea (Coneflower)
Letter from Louis Hermann Pammel to T. W. Shearer, January 16, 1917
Erigeron strigosus (Daisy)
Letter from Ada Hayden to Louis Hermann Pammel
Vernonia fasciculata (Ironweed)
Letter of recommendation from Louis Hermann Pammel to the Superintendent of Public Schools in Minneapolis, Minnesota, February 21, 1911
Eupatorium perfoliatum (Boneset)
Prairie scene
Index cards with poetic quotes

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