Google Books Ngram Viewer

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

1800 - 1951 1952 - 1987 1988 - 1991 1992 - 1995 1996 - 2000 contraception English
1800 - 1935 1936 - 1973 1974 - 1977 1978 - 1994 1995 - 2000 birth control English
1800 - 1873 1874 - 1980 1981 - 1985 1986 - 1995 1996 - 2000 abortion English

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