Thomas.R.G. Groundwater Models - Food and Agriculture Organization of the United Nations. Rome 1973 - 192p. Cht.,Fig and Table - FAO Irrigation And Drainage Paper 21 . ISBN: 92-5-100672-5 Nat. Bib. No.: 6724 Subjects--Topical Terms: Earth Sciences & Geology Universal Decimal Class. No.: 551.49 / THO