Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1825 1826 - 1855 1856 - 1868 1869 - 1966 1967 - 2008 who on earth English
1800 - 1835 1836 - 1842 1843 - 1881 1882 - 1973 1974 - 2008 who in the world English
1800 - 1830 1831 - 1922 1923 - 1938 1939 - 1982 1983 - 2008 where on earth English
1800 - 1831 1832 - 1845 1846 - 1899 1900 - 1989 1990 - 2008 where in the world English
1800 - 1854 1855 - 1921 1922 - 1932 1933 - 1986 1987 - 2008 what on earth English
1800 - 1841 1842 - 1898 1899 - 1911 1912 - 1987 1988 - 2008 what in the world English

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