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Authors: Pettengill, Robert B.
Citation: B. Pettengill, Robert, The United States foreign trade in copper: 1790-1932, American economic review , 25(2), 1935, pp. 426-441

Authors: Pettengill, Robert B.
Citation: B. Pettengill, Robert, The United States foreign trade in copper: 1790-1932, American economic review , 25(3), 1935, pp. 426-441
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