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- [6] CHAPTERS ON MACHINERY AND LABOR III. MACHINERY AND THE DISPLACEMENT OF SKILL QUARTERLY JOURNAL OF ECONOMICS, 1925, 40 (01): : 111 - 133
- [7] MACHINERY DEVELOPED TO OVERCOME LABOR SHORTAGE AGRICULTURAL ENGINEERING, 1989, 70 (05): : 21 - 21
- [8] PLANNING OF LABOR AND MACHINERY SUPPLY FOR MULTI-FARM MACHINERY USE LANDTECHNIK, 1978, 33 (12): : 546 - 547
- [9] Outsourcing Labor in Uruguay: a Comparative Study of Rural Labor and Machinery Contractors AGROCIENCIA-URUGUAY, 2013, 17 (02): : 141 - 149