The South Sawyer Glacier flows through the southwestern corner of this survey, marking a dynamic ice-carved landscape within the Tongass National Forest. This remote section of the Coast Mountains is defined by the international boundary between the Canada United States of America, where steep topographic contours and glaciated terrain meet the geopolitical line. The map highlights the vastness of the Alaskan wilderness before the ice recedes into the neighboring Canadian interior, providing a precise record of the glacial extent and the survey boundaries of t47s r78e as they stood in 2018.
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This is the sole edition of this map. No revisions or reprints were ever made.
1952 · Sumdum
USGS Topo · 1:250,000
1961 · Sumdum D-3
USGS Topo · 1:63,360
1961 · Sumdum C-3
USGS Topo · 1:63,360
1961 · Sumdum C-2
USGS Topo · 1:63,360
1961 · Sumdum
USGS Topo · 1:250,000
2000 · Sumdum C-3
USGS Topo · 1:63,360
2018 · Sumdum C-3 NE
USGS Topo · 1:25,000
2018 · Sumdum D-3 SW
USGS Topo · 1:25,000
2018 · Sumdum C-3 NW
USGS Topo · 1:25,000
2020 · Sumdum D-3 NW
USGS Topo · 1:25,000