Introduction to the study of history,
Langlois, C. Victor., Berry, G. Godfrey., Seignobos, C. (1913). Introduction to the study of history. New York: H. Holt and company.
Langlois, Charles Victor, 1863-1929, George Godfrey Berry, and Charles Seignobos. Introduction to the Study of History. New York: H. Holt and company, 1913.
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