TY  - BOOK
AU  - Petranek,Jan
ED  - International Geological Congress,
TI  - International geological Congress: report of the twenty-third session Czechoslovakia 1968. Abstracts. 
U1  - 550.63 
PY  - 1964///
CY  - New Delhi
PB  - Academia
KW  - Geology
KW  - Congresses
KW  - Physical geology
N1  - English, French, or German
ER  -