Report of Investigations - Illinois State Geological Survey
Reports of Investigations were published to release information in a timely fashion, awaiting the preparation of more detailed reports. They include summaries of the more important findings, and some contain considerable scientific findings. Although some refer to local or limited areas, all contain some data of general interest. The series is closed. No. 1 (1924) to No. 221 (1968)
(Urbana, Illinois State Geological Survey, 1966)
Contributions to the study of coal: Mineral matter of no. 6 bed coal at West Frankfort, Franklin County, Illinois (Illinois State Geological Survey, 1935)
(Champaign, IL : Illinois State Geological Survey, Prairie Research Institute, 1931)
(Illinois State Geological Survey, 1942)Report of Investigations No. 82. Two articles reprinted from the Journal of Geology.
(Illinois State Geological Survey, 1938-07-01)This report is concerned with a description and classification of spores found in the commercially important Herrin (No. 6) coal bed. The study of these minute and interesting forms of fossil plant life is one phase of ...