Google Books Ngram Viewer

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

1800 - 1816 1817 - 1847 1848 - 1862 1863 - 1963 1964 - 2000 duties English
1800 - 1825 1826 - 1952 1953 - 1971 1972 - 1988 1989 - 2000 rights English

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