Home › Authors › Helmut H. J. Geldsetzer 👤 Helmut H. J. Geldsetzer 2 books Books by Helmut H. J. Geldsetzer Reefs: Canada and adjacent ar Reefs: Canada and adjacent areas, edited by Helmut H.J. Geldsetzer [and others] 1988 Upper Devonian stratigraphy an Upper Devonian stratigraphy and sedimentology, southern Alberta Rocky Mountains 1982