Helgen, J.C. 1990. The distribution of crayfishes (Decapoda, Cambaridae) in Minnesota. Final report submitted to the Nongame Wildlife Program, Minnesota Department of Natural Resources. 96 pp.
The distinctly different distributions of six species of crawfish collected by many cooperators in Minnesota through 1987 (Cambarus diogenes diogenes, Orconectes immunis, O. propinquus, O. rusticus, O. virilis, and Procambarus acutus acutus) are given in this report, and compared with historical and U.S. distributions. Guides to the identification of the crayfish found in the state, with taxonomic keys, photographs and diagrams of key features are included.