TY  - BOOK
AU  - Berc, L. S.
TI  - Natural regions of the U.S.S.R. / 
U1  - 911.4 BER 
PY  - 1950///.
CY  - New York : 
PB  - The Macmillan Company, 
KW  - Physical geography
KW  - Soviet Union
KW  - Zoology
KW  - Botany
ER  -