Switzer, Paul V., Jared A. Switzer, and Isaac C. Switzer
New Illinois Butterfly Records for Clark, Coles, Cumberland, Douglas, and Edgar Counties
Note of a New Indicator in Water Analysis Authors: Greenfield, R.E. and Edward Bartow
The Intercision of Pike River, Near Kenosha, Wisconsin Author: Ball, J.R.
Notes on the Life-Histroy of a Cranefly of the Genus Geranomyia Haliday (Tipulidae, Diptera) Authors: Alexander, C.P. and J.R. Malloch
Note of a New Indicator in Water Analysis Authors: Greenfield, R.E. and Edward Bartow
The Intercision of Pike River, Near Kenosha, Wisconsin Author: Ball, J.R.