00458nam a2200121 a 450000100080000000500110000800800410001910000170006024501000007726000700017730000110024749000780025818160011996-04-25       1974    bl uuuu      00u1 u    #d1 aGREEN, D. A.  aEthiopiaban economic analysis of technological change in four agricultural production systems.  aEast Lansing: Board of Trustees / Michigan State Universityc1974  a120 p.  a(Occasional Papers Series. Committee on Ethiopian Studies. Monograph, 2).