Weather Service Bulletin No. 2, 1950. P. 50. Top photograph of Arctic ice from
17,000 feet taken in mid-April showing total ice coverage in area. Spider-web
appearing lines actually ice ridges, sometimes up to 10 feet high. At 86 North.
Bottom: Ice conditions at 73N, 128W. Photo from 17,000 feet in July. The dark
spots on ice are melt pools.