Google Books Ngram Viewer

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

1700 - 1798 1799 - 1807 1808 - 1891 1892 - 1967 1968 - 1980 unseductive English
1700 - 1918 1919 - 1967 1968 1969 - 1979 1980 zeitgeist English

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