Austin Post William G. Sikonia 1979 <p>In 1974 the U.S. Geological Survey began an intensive investigation of the stability of Columbia Glacier, a calving tidewater glacier terminating in Columbia Bay, near Valdez, Alaska (figure 1).&nbsp;</p> application/pdf 10.3133/ofr791265 en U.S. Geological Survey Columbia Glacier, Alaska: Recent ice loss and its relationship to seasonal terminal embayments, thinning, and glacier flow reports