Google Books Ngram Viewer

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

1800 - 1813 1814 - 1832 1833 - 1845 1846 - 1987 1988 - 2008 great dismal swamp English
1800 - 1937 1938 - 1983 1984 1985 - 2000 2001 - 2008 okefenokee swamp English

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