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المساهمون: Greenan, John Thomas, 1889-
Other Title: Recent social trends.
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المساهمون: University of Pennsylvania. Dept. of Economics, Gemmill, Paul F.
Other Title: Economic problems, Contemporary.
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المساهمون: Wubnig, Arthur, 1906- joint author
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المساهمون: Wubnig, Arthur, 1906- joint author