TY  - BOOK
AU  - Obruchev, V.
AU  - Ludwick, Persy 
TI  - Fundamentals of geology: popular outline 
U1  - 550 
CY  - Moscow
PB  - Foreign LangugaePublishing House
KW  - Geology
KW  - Geology -- fundamentals
N1  - includes bibiliographical references
ER  -