Media type: E-Article Title: Identifying trends in groundwater quality using residence time indicators: an example from the Permian aquifer of Dumfries, Scotland Contributor: MacDonald, Alan M.; Darling, W. George; Ball, Derek F.; Oster, Harald Published: Springer Science and Business Media LLC, 2003 Published in: Hydrogeology Journal, 11 (2003) 4, Seite 504-517 Language: Not determined DOI: 10.1007/s10040-003-0275-3 ISSN: 1431-2174; 1435-0157 Origination: Footnote: