Google Books Ngram Viewer

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

1960 - 1983 1984 - 1996 1997 - 1998 1999 - 2004 2005 - 2008 in vitro fertilization English
1960 - 1986 1987 - 1997 1998 - 1999 2000 - 2004 2005 - 2008 ivf English
1960 - 1970 1971 - 1983 1984 - 1986 1987 - 2001 2002 - 2008 the pill English
1960 - 1977 1978 - 1993 1994 - 1995 1996 - 2004 2005 - 2008 ocp English

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