00350nam a2200121Ia 4500082002300000100012700023245001900150260002700169300001600196500000500212653000600217700000500223  a628.11063bUn58.TR  aUnited Nations. Development of Groundwater Resources with Special Reference to Deltaic Areas. Bangkok, 24 April-8 May 1962  aTransactionsb  aNew YorkbUNESCOc1963  aviii, 244p.  a  a   a