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Lichens --- Epiphytic lichens --- Forest lichens --- United States.
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Lichens --- Lichens --- Lichenological surveys --- Lichenological surveys --- Indicators (Biology) --- Indicators (Biology) --- Forests and forestry --- Forests and forestry
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Air --- Indicators (Biology) --- Lichens --- Forest ecology --- Pollution --- Monitoring --- Middle West.
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Atmospheric deposition --- Air --- Mosses --- Heavy metals --- Indicators (Biology) --- Measurement. --- Pollution --- Effect of air pollution on --- Bioaccumulation --- Oregon
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