na INLIS000000000002995 0010-0121001361 Economic analysis of tractors ownership and utilization in South Sulawesi, Indonesia Yusuf Maamun Los Banos Univ. Of The Filippines 1983 xviii, 162 p. : ill. ; 28 cm 631.372 631.372 MECHANIZATION COSTS WEST JAVA MEKANISASI JAWA BARAT. 4173 4173