1961 Map of Sumdum D-3

About this map

South Sawyer Glacier dominates this high-altitude 1961 survey, documenting the frozen flow of ice through the coastal mountains of Southeast Alaska. The map captures the international boundary as it runs between the United States and Canada, specifically marking the divide between Alaska and British Columbia. This specific quadrangle serves as a detailed topographic record of the ice fields within the Tongass National Forest before significant late-century glacial retreat occurred.