Incoming Resources
- Flanigan-Pearson Co., Champaign, Ill., 1918
- Garrard Pub. Co., Champaign, Ill., 1970
- Garrard Pub. Co., Champaign, Ill., 1972
- Sagamore Pub., Champaign, Ill., c1995
- Illinois Natural History Survey, Champaign, Ill., 2002
- Garrard Pub. Co., Champaign, Ill., c1981
- Garrard Pub. Co., Champaign, Ill., c1980
- Garrard Pub. Co., Champaign, Ill., 1974
- J. Kuhn, priv. print., Champaign, Ill., 1946