Google Books Ngram Viewer

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

1800 - 1953 1954 - 1990 1991 - 1993 1994 - 1997 1998 - 2000 is a controversial issue English
1800 - 1962 1963 - 1989 1990 - 1991 1992 - 1996 1997 - 2000 a controversial issue today English
1800 - 1974 1975 - 1996 1997 1998 1999 - 2000 an issue of public concern English

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