. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Land ⢠15 Figure 4-2 Coal Mine Locations In Illinois Coal Bearing Strata Pre-1962 Mining Sites Post-1962 Mining Sites. 0 Spkm â I l-l M From ISGS Coal Database. 1993 Mineral extraction is declining in Illinois. ⢠Coal output in Illinois during World War II was 78 million tons per year; in 1990 it was 60 million tons. Oil production hit a peak of about 148 million barrels in 1940 and declined to 19 m
. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Land ⢠15 Figure 4-2 Coal Mine Locations In Illinois Coal Bearing Strata Pre-1962 Mining Sites Post-1962 Mining Sites. 0 Spkm â I l-l M From ISGS Coal Database. 1993 Mineral extraction is declining in Illinois. ⢠Coal output in Illinois during World War II was 78 million tons per year; in 1990 it was 60 million tons. Oil production hit a peak of about 148 million barrels in 1940 and declined to 19 million barrels in 1991. Pages 24 and 27 Source: Raniircci. Illiniiis (â Survey. I'*'M. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Nature of Illinois Foundation. [Springfield, Ill. ?] : Ill. Dept. of Energy and Natural Resources, the Nature of Ill. Foundation
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