na INLIS000000000011019 Ind 0010-1118011019 An introduction to agricultural engineering ROTH, L.O. L.O. Roth; F.R. Crow, G.W.A. Mahoney 3 rd printing Westport AVI Publishing 1979 ix, 356 p.: ill.; 23 cm. ix, 356 p.: ill.; 23 cm. 631.4ROTi 631.4 AGRICULTURAL ENGINEERING 3 rd printing 5548/84