Report of the twenty-first session, Norden  Denmark, Finland, Iceland, Norway, Sweden 
general editor: Theodor Sorgenfrei 
 - Copenhagen  Berlingske Bogtrykkeri  1960 
 - 28 v. : ill. ; 24 cm. 
<br/><br/> English, French, German, or Spanish. 
<br/><br/><br/>engfregerspa 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Congresses