Google Books Ngram Viewer

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

1975 - 1977 1978 1979 - 1987 1988 - 2001 2002 - 2008 the nanking incident English
1975 - 1993 1994 - 2005 2006 2007 2008 the nanjing incident English

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