Google Books Ngram Viewer

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

1800 - 1837 1838 - 1908 1909 - 1920 1921 - 1970 1971 - 2000 points of contact English
1800 - 1803 1804 1805 - 1835 1836 - 1979 1980 - 1990 point of contacts English

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