Glacial map of North America  [material cartográfico] 

, Escala: 1:4'555,000 
 - New York :  The geological society of America ,  19451949 
<br/><br/> 2 feuilles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Glaciologie
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Amérique du Nord