The tall grass prairie forms a belt across the United States from Canada to Mexico. This belt lies between the deciduous forest on the east and the plains association on the west. It is approximately 250 miles wide except at a point slightly above the middle where it extends to about three times this width from eastern Nebraska across Iowa and northern Missouri, Illinois and Indiana into western Ohio.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
Aikman, J. M.
"Competition Studies in the Ecotone between Prairie and Woodland,"
Proceedings of the Iowa Academy of Science, 35(1), 99-103.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/16