00319nam a2200121Ia 4500082002100000100003600021245005500057250000800112260002600120300001600146500000500162700003000167  a309.263bW579.RR  aWhitby, M. C. amd Willis, K. G.  aRural resource development; an economic approachb  a2nd  aLondonbMethuenc1978  a303p. Index  a  aWillis, K. G. ; jt. auth.