Contents

31 March 1972
Vol 175, Issue 4029

About The Cover

View of Alaska from space on a rare, cloud-free day. Snow blankets much of the land area. Trees, obscuring the snow, appear as dark areas. Picture was taken by Nimbus IV Image Dissector Camera System (scale, approximately 1 : 15,000,000). See page 4029. [National Aeronautics and Space Administration, Greenbelt, Maryland]