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Long-term monitoring of environmental change in German towns through the use of lichens as biological indicators: comparison between the surveys of 1970, 1980, 1985, 1995, 2005 and 2010 in Wetzlar and Giessen

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Ulrich Kirschbaum^*, Rainer Cezanne, Marion Eichler, Klaus Hanewald and Ute Windisch

Environmental Sciences Europe 2012, 24:19 doi:10.1186/2190-4715-24-19

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