title: Sample surveys on internal migration in Africa, 1960-1980: scope, methodologies and problems.
mesh_terms: D000349:Africa; D019352:Censuses; D003625:Data Collection; D003710:Demography; D003906:Developing Countries; D004641:Emigration and Immigration; D005069:Evaluation Studies as Topic; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D015203:Reproducibility of Results; D012106:Research; D012107:Research Design; D012494:Sampling Studies
keywords: Africa; Census; Data Collection; Demographic Factors; Developing Countries; Error Sources; Evaluation Methodology; Measurement; Migration; Migration, Internal; Population; Population Dynamics; Population Statistics; Reliability; Research Methodology; Sampling Studies; Studies; Survey Methodology; Surveys