Google Books Ngram Viewer

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

1800 - 1853 1854 - 1966 1967 - 1977 1978 - 1988 1989 - 2000 theory English
1800 - 1813 1814 1815 - 1830 1831 - 1876 1877 - 1956 theorics English

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