Google Books Ngram Viewer

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

1800 - 1858 1859 - 1968 1969 - 1977 1978 - 1997 1998 - 2008 political science English

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