Terzaghi, Karl. <br/><br/>
Permafrost / by Karl Terzaghi. 

 - Cambridge, Mass. : Harvard University 
 - 50 p. 
 - Harvard soil mechanics Series ; no. 37 .
<br/><br/> "Reprinted from Journal of the Boston Society of Civil Engi-neers, volume 39, January 1952, pages 1-50".