00283nam a2200109 a 450000500170000008200150001710000270003224500330005926000270009230000270011963000270014620251203091223.0  a363.7bENV  aFletcher, William Wd_  aEconomics of the environment  aGlasgowbBlackiec1979  axii,193 p.c22 cm.bHB  aEnvironmental Problems