Google Books Ngram Viewer

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

1920 - 1939 1940 - 1993 1994 - 1998 1999 - 2002 2003 - 2008 киевская русь Russian
1920 - 1954 1955 - 1996 1997 - 2000 2001 - 2004 2005 - 2008 древнерусское государство Russian

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