Das Problem von der Quadratur des Zirkels.

Reprinted from "Vierteljahrschrift der Naturforschenden Gesellschaft in Zürich, 35. Jhrg., 1. Heft."

Prairie Parklands area assessment.

Examines 1,477 square miles in northeastern Illinois that historically was open prairie with a park-like appearance of scattered trees. The area encompasses 25 subbasins along the Illinois, Des Plaines, and Kankakee rivers, of which 8 have been designated a state Resource Rich Area.