Google Books Ngram Viewer

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

1800 - 1857 1858 - 1924 1925 - 1934 1935 - 1984 1985 - 2000 teacher English
1800 - 1812 1813 - 1825 1826 - 1872 1873 - 1966 1967 - 2000 principal English
1800 - 1849 1850 - 1930 1931 - 1941 1942 - 1983 1984 - 2000 school English

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