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Acidification in Three Lake District Tarns: Historical Iong..:

Whitchead, P. G ; Barlow, J ; Haworth, E. Y.
Hydrology and Earth System Sciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2100610 -- http://www.hydrol-earth-syst-sci.net/volumes_and_issues.html -- 1607-7938.  , 1997