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information processing education Studies Research Methodology Africa south of the Sahara economics population methodology demography social change developing country Surveys labour migration environmental protection Population Dynamics Developing Countries epidemiology Southern Africa Sampling Studies rural population Agriculture housing Environment financial management animal Residence Characteristics spatial distribution investment geography labor migration rural economy Africa Article migration Geographic Factors population and population related phenomena Demographic Factors English Speaking Africa Africa, Southern research Emigration and Immigration Animal Resources remittances Economic Factors migration effect Transients and Migrants wage transfer Population Characteristics Conservation of Natural Resources migration impact Macroeconomic Factors Financial Activities Natural Resources agricultural impact Swaziland Animal Population Groups male labour Data Collection Investments