"University of Pittsburgh. University Library System. Digital Research Library." . . "Buitenlandse betrekkingen." . . "United States, Foreign relations, China." . . "Polemologie." . . . . "Verenigde Staten." . . "United States" . . "China, Foreign relations, United States." . . "Progressivism and the open door America and China, 1905-1921"@en . . . . . . . . . . . . . . . . . . . "Progressivism and the open door; America and China, 1905-1921" . . . . . "Progressivism and the open door : America and China, 1905-1921" . . "Progressivism and the open door : America and China 1905-1921" . . . "China" . . "China." .