Blake and Sons / E.H. Glenn and Sons Inc. / Henry Boysen Company / BT / J. Huemann and Sons / S.O.S. Service Inc. / General Revenue Funds / Snelton and Sons / Bedrock Resources / /
WISCONSIN Department / Mapping Department / Lake County Health Department / Association of American State Geologists / GIS / Central Great Lakes Geologic Mapping Coalition / Illinois Department of Natural Resources / and the State of Illinois / Geological Records Unit of the Illinois State Geological Survey / /
Person
Mathew H. Riggs / William W. Shilts / Michael L. Sargent / Dennis R. Kolata / Antigone B. Dixon-Warren / / /