na INLIS000000000011320 Ind 0010-1118011320 Fertility of soils : a future farming in the West African savannah PIERI, Christion J.M.G. Christian J.M.G. Pieri Berlin Springer-verlag 1992 xvi, 348 p.: ill.; 23 cm. xvi, 348 p.: ill.; 23 cm. ISBN 3-540-53283-8 631.45PIEf 631.45 SOIL FETILITY WEST AFRICA 256/96-mfn13103