na INLIS000000000006570 Ind 0010-1118006570 Prosfects for the drainage of clay soils RYCROFT, DAVID W by David, W. Rycrift; Mohamed H. Amer Rome FAO 1995 xii, 134 p.: ill.; 30 cm xii, 134 p.: ill.; 30 cm ISBN: 92-5-103624-1 FAO Irrigation and Drainage Paper No. 51 631.62 CLAY SOILS DRAINAGE AGRICULTURAL DEVELOPMENT 161/FAO/96