Google Books Ngram Viewer

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

1800 - 1893 1894 - 1949 1950 1951 - 1997 1998 - 2000 styx river English
1800 - 1854 1855 - 1970 1971 - 1984 1985 - 1993 1994 - 2000 river styx English

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