. Annual program report, 1990. Acidic Precipitation in Ontario Study; Acid precipitation (Meteorology); Acid pollution of rivers, lakes, etc; Acid rain. Figure 21 Sugar Maple Growth Across a Pollution Gradient in Ontario 46. 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 Acidic Precipitation in Ontario Study; Ontario. Ministry of the Environment. [Toronto] : Ministry of the Environment, A. P. I. O. S. Coordination Office

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