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Plummer, Wilbur Clayton 1889- ed, Charles P. White, and Charles Pressley White. Markets of the United States: W.C. Plummer and Charles P. White. Philadelphia: The American Academy of Political and Social Science, 1926.

Plummer, Wilbur Clayton 1889- ed, et al. Markets of the United States: W.C. Plummer and Charles P. White. The American Academy of Political and Social Science, 1926.