Geology for planning in Winnebago and Boone counties : workshop /

"Conducted by the Illinois State Geological Survey in cooperation with the Boone County Board, Winnebago County Board, Boone County Soil and Water Conservation District, Winnebage County Soil and Water Conservation District and Rock Valley College."

Current information on urban land policies:

"ST/SOA/9."

Land and water use in Yuba-Bear Rivers hydrographic unit.

Mode of access: Internet.

Guidelines for air quality maintenance planning and analysis.

Vol. 7: second ed., 1975.