00868nam a2200253 a 450000100080000000500110000800800410001910000140006024500460007425000110012026000280013130000110015952002700017065000160044065000160045665000330047265000130050565000150051865000180053365000100055165300190056165300180058070000160059811519892013-04-15       1966    bl uuuu      00u1 u    #d1 aCLARK, C.  aThe economics of subsistence agriculture.  a2. ed.  aLondon: Macmillanc1966  a216 p.  aFood requirements; Pre-agricultural man; primitive and shifting agriculture; Agricultural progress measured in grain equivalents; Production and productivity; Rents and prices of agricultural land; Labour and land; Transport; Consuption; Trade, aid and development.  aAgriculture  aAgricultura  aAgricultura de Subsistência  aAlimento  aProdução  aProdutividade  aTerra  aEconomia rural  aRural economy1 aHASWELL, M.