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7Published 1992.“…Thesis (Ph.D.) University of Pennsylvania, 1968.…”
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8Published 1982.“…Dissertation University of Pennsylvania, 1977. - Bibl., index.…”
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9Published 1980.“…Diss. University of Pennsylvania, 1970. - Bibl., index.…”
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10Published 1978.“…., index. - Ph.D. University of Pennsylvania 1975.…”
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11Published [1968]“…Published for the Foreign Policy Research Institute, University of Pennsylvania.…”
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13Published 1961.“…The Foreign Policy Research Institute, University of Pennsylvania.…”
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14“…Publications of the University of Pennsylvania. Series in political economy and public law. - Ex-libris de la "American Chamber of commerce in France"…”
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15Published 1972.“….: Philadelphia, Penn., University of Pennsylvania Press, 1942. The American utopian adventure. …”
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16Published 1970-“…Wharton school of finance and commerce. University of Pennsylvania. 1.Negro employment in basic industry. …”
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