Ground water level changes and demographic analysis of ground water in Illinois /

"October, 1981."

The Illinois Gap Analysis final report, 2006.

U.S. Geological Survey, Department of Interior Cooperative Agreement No. 14-48-0003-95-1090

Analysis of costs and revenues in the timber program of four national forests.

Shipping list no.: 86-133-P.

Guidelines for air quality maintenance planning and analysis.

Vol. 7: second ed., 1975.