Biennial report for 1911 and 1912;
administrative report and economic and geological papers.
APA Citation
Illinois State Geological Survey. (1917). Biennial report for 1911 and 1912: administrative report and economic and geological papers. Urbana.
MLA Citation
Illinois State Geological Survey. Biennial Report for 1911 And 1912: Administrative Report And Economic And Geological Papers. Urbana, 1917.
Warning: These citations may not always be complete (especially for serials).