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Statistics by the late Robert Giffen written about the years 1898 - 1900
Giffen, Robert, (1913)
Statistical papers of George Udney Yule : (born 1871 - died 1951)
Yule, George Udny, (1971)
[Besprechung von:] Annals of the Royal Statistical Society, 1834-1934. London 1934
Yule, George Udny, (1934)