00506nam a2200157Ia 4500 0000016493 20251012174546.0 800529s1973 sz i00 0 enghc 9221010090 HD1459 I57 Mechanisation and employment in agriculture case studies from four continents International Labour Office Geneva I.L.O 1973 192p 24cm Agricultural laborers Case studies. Farm mechanization Case studies. 6134 6134