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Digging in permafrost at Centrum Lake, snow cover of 2 ft. Use of oil fire to m
Stanley Needleman
35mm slide
20th century Greenland image
Permafrost raised polygons from the air in Peary Land.
Stanley Needleman
35mm slide
20th century United States image
Soil engineering and permafrost tests in test pits along the proposed runway
Stanley Needleman
35mm slide
20th century Greenland image
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