Google Books Ngram Viewer

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

1790 - 1800 1801 - 1916 1917 - 1931 1932 - 1974 1975 - 2000 liberty English
1790 - 1836 1837 - 1967 1968 - 1978 1979 - 1990 1991 - 2000 freedom English

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