Biodiversity Heritage Library
By "Illinois. State Geologist "
Geological survey of Illinois A.H. Worthen, director ... Published by the authority of the legislature of Illinois
By: Lindahl, Josua, - Worthen, Amos Henry, - Illinois. State Geologist
Publication info: Springfield, Ill. :State Journal Steam Press,1866-1890
Contributed by: University of California Libraries (archive.org)