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Reference
Berichte des Deutschen Wetterdienstes / Climatology of total ozone measurements 1964 - 1997 at Potsdam : based on re-evaluated Dobson series / by Dietrich Spänkuch ... Offenbach am Main : Selbstverl. des Dt. Wetterdienstes, 1999. , I A 11, / CC-BY-License (4.0)