Report of the twenty-third session, Czechoslovakia, 1968  abstracts 
general editor: Miroslav Malkovsky ; edited by Jan Petranek 
 - Prague  Academia  1968 
 - 396 p. ; 24 cm. 
<br/><br/> English, French, or German.  At top of t.p.: International Geological Congress 
<br/><br/><br/>engfreger 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Congresses--Abstracts