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The comparative study of urbanization has been hampered by a lack of comparable units of observation. The delineation of standardized "metropolitan areas" throughout the world permits the study of recent growth in the largest agglomerations in seventy-eight countries and territories.Higher rates of metropolitan growth are found in the underdeveloped areas,lower rates of growth in the industrialized portion of the world.Metropolitan areas are capturing a very high proportion of the total increase accrucing to the industrialized nations.
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Gibbs et al. (1960) studied this question.
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