[057-23]Notes on the Algal Flora of Knox County, Illinois
Ricker, Julia G, Mester, Anne E., and Weik, Kenneth L. Notes on the Algal Flora of Knox County, Illinois 057-23-print
[057-10]New Species of Winter Stoneflies, Genus Allocapnia (Plecoptera, Capniidae)
Ross, Herbert H. and Ricker, William E. New Species of Winter Stoneflies, Genus Allocapnia (Plecoptera, Capniidae) 057-10-print