. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. EROSION AND SEDIMENTATION. 1921-30 1931-40 1941-50 1951-60 1961-70 1971-80 PERIOD OF SURVEYS BY DECADES 1981-90 Figure 8. History of lake sedimentation surveys in Illinois 62. 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 Illin
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. EROSION AND SEDIMENTATION. 1921-30 1931-40 1941-50 1951-60 1961-70 1971-80 PERIOD OF SURVEYS BY DECADES 1981-90 Figure 8. History of lake sedimentation surveys in Illinois 62. 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; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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