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α: calibrated so average coauthorship-adjusted count equals average raw count
Spain's contribution to the “New Emigration” differed from that of other Southern European countries in that it was oriented to Latin America far more than to the United States, in that it reached massive proportions only after 1900, and in that the various Spanish provinces varied greatly in their emigration rates. Differences in wealth, income, literacy, urbanization, and migratoly tradition best explain these international and interprovincial differences.