Johnson County lies in the south eastern quarter of Iowa , its eastern boundary being about forty-five miles from the Mississippi River reckoning from Davenport and owing to the curvature of the river to the westward about eighteen miles from Muscatine. The county has an area of about 618 square miles and the elevation ranges from slightly over six hundred feet in the south eastern corner to nearly eight hundred at Solon.
Proceedings of the Iowa Academy of Science
©1913 Iowa Academy of Science, Inc.
Somes, M. P.
"Notes on the Flora of Johnson County, Iowa,"
Proceedings of the Iowa Academy of Science, 20(1), 26-101.
Available at: https://scholarworks.uni.edu/pias/vol20/iss1/8