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Rebecca D. Fields, Larry L. St. Clair, A Comparison of Methods for Evaluating SO2 Impact on Selected Lichen Species: Parmelia chlorochroa, Collema polycarpon and Lecanora muralis, The Bryologist, Vol. 87, No. 4 (Winter, 1984), pp. 297-301
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Fields et al. (1984) studied this question.
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