Google Books Ngram Viewer

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

1800 - 1847 1848 - 1934 1935 - 1947 1948 - 1991 1992 - 2008 thomas jefferson English
1800 - 1978 1979 - 2000 2001 2002 - 2007 2008 sally hemings English

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