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Migrant Workers urban population South and Central America Americas Latin America economics population Migrants demography social change developing country Population Dynamics Agricultural Workers Developing Countries Research Report rural population Agriculture Developed Countries Time Factors socioeconomic status Central America Mexico Temporary Migration United States social status Occupations North America sociology Manpower Needs health care manpower occupation Health Manpower Acculturation Socioeconomic Factors Multivariate Analysis Behavior socioeconomics Western Hemisphere cultural factor Occupational Status--changes Article employment status migration international migration developed country population and population related phenomena Demographic Factors Emigration and Immigration Economic Factors Transients and Migrants social class Northern America Population Characteristics Human Resources Macroeconomic Factors employment Labor Force social behavior time