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World Population 1900-1990 Index World Population in 1900 World Population in 1910 World Population in 1920 World Population in 1930 World Population in 1940 World Population in 1950 World Population in 1960 World Population in 1970 World Population in 1980 World Population in 1990 Total World Population 1900-1990 World War I Population World War I Casualties Soldiers & Steel Production 1914 World War II Casualties