R. L. Westemeier, Illinois Natural History Survey, Effingham, IL 62401, USA. J. D. Brawn, Illinois Natural History Survey, Champaign, IL 61820, USA. S. A. Simpson and T. L. Esker, Illinois Department of Natural Resources, Newton, IL 62448, USA. R. W. Jansen, Douglas-Hart Nature Center, Mattoon, IL 61938, USA. J. W. Walk and E. L. Kershner, University of Illinois, Department of Natural Resources and Environmental Sciences, Urbana, IL 61801, USA. J. L. Bouzat and K. N. Paige, University of Illinois,... (At 1998-11-27)