@book{bhlitem51111, title = {Bulletin }, volume = {31 (1973-1977)}, copyright = {In copyright. Digitized with permission of the rights holder. Contact digicc@library.illinois.edu for information.}, url = {https://www.biodiversitylibrary.org/item/51111}, note = {https://www.biodiversitylibrary.org/bibliography/14605}, publisher = {Urbana State of Illinois, Dept. of Registration and Education, Natural History Survey Division 1918-1985}, author = {Illinois. Natural History Survey Division}, year = {1973}, pages = {564}, keywords = {Illinois|Natural history}, }