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Yearbook of the Federal Republic of Germany : calendar year 1969
(Federal Institute of Hydrology and the German Research Association, 1972)
Yearbook of the Federal Republic of Germany : calendar year 1970
(Federal Institute of Hydrology and the German Research Association, 1970)
Yearbook of the Federal Republic of Germany : calendar year 1973
(Federal Institute of Hydrology and the German Research Association, 1976)
Yearbook of the Federal Republic of Germany : calendar year 1971
(Federal Institute of Hydrology and the German Research Association, 1976)
Yearbook of the Federal Republic of Germany : calendar year 1974
(Federal Institute of Hydrology and the German Research Association, 1977)
Yearbook of the Federal Republic of Germany : calendar year 1972
(Federal Institute of Hydrology and the German Research Association, 1976)
Yearbook of the Federal Republic of Germany : calendar year 1975
(Federal Institute of Hydrology and the German Research Association, 1979)