na INLIS000000000002727 Ind 0010-1118002727 Agricultural engineering in development : tillage for crop production in areas of low rainfall GODWIN, R.J. by R.J. Godwin Rome FAO 1990 vi, 124 p. : ill. ; 30 cm.-- vi, 124 p. : ill. ; 30 cm.-- 92-5-102542-8 Bibl. p. 120-124 631.31 TILLAGE EQUIPMENT ENGINEERING 1335/FAO/91