| http://www.w3.org/ns/prov#value | - Considerable effort is devoted to mapping geographic patterns and defining lichen indicator species suitable for estimating air quality and climate. ???Excessive N is a growing problem in many developed nations as documented in many studies (Driscoll et al. 2003, Fenn et al. 1998, Holland et al. 2005, Vitousek et al. 1997).
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