00393nam a2200157Ia 45000030005000000080041000050400013000460410008000590500015000671000023000822450046001052500007001512600035001583000011001936500031002041132200817s9999 xx 000 0 und d cCIC-UMAD aeng aTD180bT46 aThomson, Donald N. 4aThe economics of environmental protection a1a aEstados UnidosbWinthropc1973 a278 p. aEconomía, medio ambiente