TY  - BOOK
ED  - Symposium on problems relating to environment (1971 : Czechoslovakia)
TI  - Symposium on problems relating to environment
U1  - "X:(G:55)p1,N7, L1/UN" 
PY  - 1971///
CY  - New
PB  - York United Nations USA    
KW  - Environmental Economics
N1  - Sales No. E.71.II.E.6
ER  -