Google Books Ngram Viewer

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

1900 - 1907 1908 - 1926 1927 - 1935 1936 - 1992 1993 - 2000 father English
1900 - 1908 1909 - 1972 1973 - 1982 1983 - 1992 1993 - 2000 mother English
1900 - 1906 1907 - 1921 1922 - 1928 1929 - 1982 1983 - 2000 both father and mother English
1900 - 1930 1931 - 1984 1985 - 1989 1990 - 1994 1995 - 2000 both mother and father English

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