Illinois Natural History Survey Manuals, (includes field guides, field books, and field manuals), have been published at irregular intervals since 1936. These manuals are field guides that provide detailed descriptions and illustrations of a particular group of organisms, e.g., mammals, butterflies, reptiles and amphibians, freshwater mussels, etc. INHS Manuals should fit into a jacket or coat pocket when used in the field. They offer complete species descriptions, including natural history, distribution, and status. Nature lovers, ranging from professional scientists to school children, can make use of these books.
The INHS Manual 09: Field Guide to Butterflies of Illinois is out of print and the new extended edition is INHS Manual 14.
INHS Manual 15: Field Guide to Crayfishes of the Midwest