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Yearbook of the Federal Republic of Germany : calendar year 1987
(Federal Institute of Hydrology and the German Research Association, 1990)
Yearbook of the Federal Republic of Germany : calendar year 1990
(Federal Institute of Hydrology and the German Research Association, 1993)
Yearbook of the Federal Republic of Germany : calendar year 1988
(Federal Institute of Hydrology and the German Research Association, 1991)
Yearbook of the Federal Republic of Germany : calendar year 1989
(Federal Institute of Hydrology and the German Research Association, 1993)