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  1. Correspondence : Worthen (Amos) and Engelmann (George), 1867.
    By: Worthen, Amos Henry,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  2. Geological survey of Illinois
    By: Lindahl, Josua, - Worthen, Amos Henry, - Illinois. State Geologist
    Publication info: Springfield, Ill. :State Journal Steam Press,1866-1890
    Holding Institution: University of California Libraries (archive.org)
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  3. Geological Survey of Illinois,
    By: Illinois. State Geologist. - Worthen, Amos Henry,
    Publication info: [Springfield,State Journal Steam Press, etc.]1866-90.
    Holding Institution: Smithsonian Libraries
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