. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report A 600 ouu 500 m 400 pn 300 — 200 100 0 n r~i 1 -J-i^ 1—1 n n 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990. Fig. 6. A. Total perlid stonefly records by decade in the 20th Century; B. Percentage of perlid records in a decade corresponding to one of six genera. 84. Please note that these images are extracted from scanned page images that may have been digitally enhanced for reada

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. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report A 600 ouu 500 m 400 pn 300 — 200 100 0 n r~i 1 -J-i^ 1—1 n n 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990. Fig. 6. A. Total perlid stonefly records by decade in the 20th Century; B. Percentage of perlid records in a decade corresponding to one of six genera. 84. 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; Illinois. Natural History Survey Division; Critical Trends Assessment Project. [Illinois] : Illinois Dept. of Natural Resources, Office of Realty and Environmental Palnning : Office of Scientific Research and Analysis, Natural History Survey Division

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