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Yankee enterprise : the rise of the American system of manufactures; a Symposium sponsored bythe United States Chamber of Commerce helt at the Dibner Rare Book Library National Museum of American History, Smithosonian Institution
Mayr, Otto, (1981)
Report of the second Trade and Market Development Conference : Washington, D. C., September 28-29, 1931
(1931)
Impact of travel and tourism on the US and state economies
(2005)