Google Books Ngram Viewer

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

1980 - 1982 1983 - 1987 1988 1989 - 1992 1993 - 2008 nuclear war English
1980 - 1991 1992 - 2004 2005 - 2006 2007 2008 global warming English

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