00436     2200169   4500001002100000035002000021245005100041100001700092260005100109300002500160084000700185082000700192650002900199650002000228990000900248990000900257INLIS000000000002797  a0010-0121001163  aAn almost practical step toward sustainability  aRobert Solow  aWashington, DCbResources for The Futurec1992  a22 p. :cill ; 30 cm  a33  a33  aECONOMICS-SUSTAINABILITY  aSUSTAINABILITY.  a3931  a3931