. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Year Figure 29. Statewide average day (Julian day number) of last spring frost in Illinois (defined for both 28"F and 32''F), 250 '11111 [ 111111 mill I ri 11111111 11 111111 111111111111111111111 Ill' 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Year Figure 30. Statewide average day (Julian day number) of first autumn frost in
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Year Figure 29. Statewide average day (Julian day number) of last spring frost in Illinois (defined for both 28"F and 32''F), 250 '11111 [ 111111 mill I ri 11111111 11 111111 111111111111111111111 Ill' 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Year Figure 30. Statewide average day (Julian day number) of first autumn frost in Illinois (28"F and 32''F), I90I-I99I. 39. 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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Keywords: ., bookcentury1900, booksubjecte, booksubjectecology, booksubjectman
