Original hand-written field notes, many of which were also typed and organized by location. The original field notes are cataloged and searchable in an online catalog https://www.isgs.illinois.edu/publications/maps.
This collection record was derived from a survey of State Geological Survey organizations conducted under the National Geological and Geophysical Data Preservation Program. Final Harvest from State Inventory on Fri Nov 12 16:40:39 CST 2010
NGGDPP Collection Extension
Research (Research, http://www.sciencebase.gov/vocab/category/NGGDPP/collection/primaryPurpose)