00467nam a2200169Ia 4500008004100000020001500041082001600056100002400072245005300096260004500149300000800194650001400202650002000216653001600236653002100252653002400273170901s1969    xx            000 0 und d  a0020207018  a338.1bW36S  aWharton, Clifton R. 0aSubsistence Agriculture and Economic Development  aChicagobAldine Publishing Companyc1969  a481  aEconomics  aSocial sciences  aAgriculture  aEconomic aspects  aMathematical models