TY  - BOOK
AU  - Popov,I.V.
AU  - Kotlov,F.V.
AU  - Popov,I.V.
TI  - The stability of slopes
U1  - 551.41 POP K 
PY  - 1963///.
CY  - New York : 
PB  - Consultants Bureau,  
KW  - Slopes (Physical geography)
KW  - Engineering geology
KW  - Stability
ER  -