Incoming Resources
- Garrard Pub. Co., Champaign, Ill., 1965
- Garrard Press, Champaign, Ill., 1961
- Garrard, Champaign, Ill., c1965
- University of Illinois at Urbana-Champaign, Institute of Natural Resource Sustainability, Illinois State Geological Survey, Champaign, Ill., 2010
- Sagamore Pub., Champaign, Ill., c1995
- Illinois Natural History Survey, Dept. of Energy and Natural Resources, State of Illinois, Champaign, Ill., 1987