Smithsonian Report. 1950. — Black 



Plate 8 



Thermokarst or cave-in lake about 10 miles east of Mentasta Lake on the 

 Slana-Tok Cut-off in east-central Ala.ska. Photographed July 9, 1946. 



rinyu, e^liniuled ()U feet high, on tlie coastal plain of northern Alaska, about 

 30 miles north of Umiat, Alaska. Photographed September 17, 1945. 



