Google Books Ngram Viewer

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

1950 - 1955 1956 - 1986 1987 - 1991 1992 - 1996 1997 - 2000 czar English
1950 - 1954 1955 - 1967 1968 - 1971 1972 - 1994 1995 - 2000 tsar English

Run your own experiment! Raw data is available for download here.
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