01830cam a2200301Ia 4500 4053424 20020415165409.0 980522m19989999iluab b s000 0 eng d (OCoLC)ocm39165585 BCE-2075 Illinois Department of Natural Resources, 524 South Second, Springfield, Ill. 62701 SPI SPI n-us-il Illinois. Dept. of Natural Resources. Office of Scientific Research and Analysis. Illinois River Bluffs area assessment / Illinois Department of Natural Resources, Office of Scientific Research and Analysis, [and the] State Geological Survey Division. At head of title on cover: Critical Trends Assessment Program Springfield, Ill. : Illinois Dept. of Natural Resources, 1998- v. : ill., maps ; 28 cm. "The Illinois River Bluffs Area Assessment examines an area in west-central Illinois that includes parts of the upper and lower Illinois River watersheds from the vicinity of Hennepin southward to East Peoria ... designated a state Resource Rich Area."--P. iii. "Critical Trends Assessment Program."--Cover. Includes bibliographical references. v. 1. Geology -- v. 2. Water resources -- v. 3. Living resources -- v. 4. Socio-economic profile. Environmental quality. Archaeological resources -- v. 5. Early accounts of the ecology of the Illinois River Bluffs Area. Natural resources conservation areas Illinois Illinois River Watershed. Natural resources surveys Illinois Illinois River Watershed. Illinois River Watershed (Ill.) Illinois. Dept. of Natural Resources. Critical Trends Assessment Project. Illinois State Geological Survey.