Urbana: State of Illinois Dept. of Registration and Education, Natural History Survey Division, 1976.

scholarly article published in The Condor in May 1983

Champaign, Ill. :State of Illinois, Dept. of Energy and Natural Resources, Natural History Survey Division,[1987] | University Librar

Urbana: State of Illinois, Dept. of Registration and Education, Natural History Survey Division, 1977.

Urbana: State of Illinois, Dept. of Registration and Education, Natural History Survey Division, 1983.

Champaign, Ill. :State of Illinois, Dept. of Energy and Natural Resources, Natural History Survey Division,[1985] | University Library, University of Illinois Urbana Champaign Vi

Urbana: State of Illinois, Dept. of Registration and Education, Natural History Survey Division, 1978.

Urbana: Illinois Natural History Survey, 1972.

Urbana, State of Illinois, Natural History Survey Division, 1970.