00358nam a2200109Ia 4500082002400000100006500024245010100089260003500190300001300225500000500238700000500243  a333.091724bUn58.NR  aUnited Nations. Economic and Social Affairs, Department of-.  aNatural resources of developing countries; investigation, development and rational utilizationb  aNew YorkbUnited Nationsc1970  ax, 174p.  a  a