National Geographic : 1952 Jan
134 Bradford Washburn Earth-sculpturing Glaciers Retreat as Climate Warms. They May Advance Again inaNew IceAge Nearly a third of Earth's land has been covered at least once by ice creeping from highlands, as Alaska's Susitna Glacier does here. Rivers oficeconverge from the the slopes of 13,740-foot Mount Hayes and other peaks southeast of Fairbanks. Dark bands of rock scraped from mountains streak theglacier (page 133).