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1Published 1922“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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2Published 1922“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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3Published 1927“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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4Published 1927“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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5Published 1931“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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6Published 1931“...Bulletin series (University of Illinois at Urbana-Champaign. Bureau of Economic and Business...”
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