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  1. Geological survey of Illinois A.H. Worthen, director ... Published by the authority of the legislature of Illinois
    By: Lindahl, Josua, - Worthen, Amos Henry, - Illinois.
    Publication info: Springfield, Ill. :State Journal Steam Press,1866-1890
    Contributed by: University of California Libraries (archive.org)
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  2. Geological Survey of Illinois,
    By: Illinois. - Worthen, Amos Henry,
    Publication info: [Springfield,State Journal Steam Press, etc.]1866-90.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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