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Abstract
An article by one of the pioneers of the Norwegian Geographical Society, the geologist Hans Reusch, demonstrates how skilled observations in the landscape a hundred years ago produced important ideas. In recent years, however, new knowledge has effected some of the theories which were based upon these ideas. The fate of the theory of ice-free refugia during the Ice Age in Scandinavia should demonstrate how recent research in various sciences effected a theory based upon ideas proposed a hundred years ago.