Google Books Ngram Viewer

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

1800 - 1934 1935 - 1993 1994 - 1995 1996 - 1998 1999 - 2000 sexology English
1800 - 1977 1978 - 1987 1988 - 1989 1990 - 1995 1996 - 2000 sex therapy English
1800 - 1937 1938 - 1969 1970 - 1973 1974 - 1994 1995 - 2000 sex education English

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