Pressure ridges, Arctic Ocean. Anglo-American Polar Expedition. Canning district, Northern Alaska region, Alaska. C. 1910. – ID. Leffingwell, E.K. 25 – lek00025 – U.S. Geological Survey – Public domain image
Pressure ridges, Arctic Ocean. Anglo-American Polar Expedition. Canning district, Northern Alaska region, Alaska. C. 1910. – ID. Leffingwell, E.K. 25 – lek00025 – U.S. Geological Survey – Public domain image