TY  - BOOK
AU  - Heal Geoffrey
TI  - Valuing the future:  Economic theory and sustainability.   
T2  - Economics for Sustainable Earth
SN  - 0231113064
U1  - X:77:(G:55), N8 
PY  - 1998///
CY  - New York
PB  - Columbia University Press       
KW  - Economic Development irt Environment
ER  -