Google Books Ngram Viewer

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

1800 - 1836 1837 - 1915 1916 - 1926 1927 - 1980 1981 - 2008 coal English
1800 - 1835 1836 - 1944 1945 - 1956 1957 - 1987 1988 - 2008 oil English

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