Guide to excursion / 
by Vladimir Sattran, Augustin Gorek 
 - Praha :  Geological Survey of Czechoslovakia in Academia,  1967- 
 - v. :  ill. ;  19 cm. 
<br/><br/> At head of t.p.: International Geological Congress XXIII Session, Prague,1968 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Congresses<br/>Geology--Czechoslovakia