Google Books Ngram Viewer

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

1800 - 1809 1810 - 1818 1819 - 1827 1828 - 1987 1988 - 2000 discourse English
1800 - 1843 1844 - 1965 1966 - 1977 1978 - 1989 1990 - 2000 discussion English
1800 - 1824 1825 - 1974 1975 - 1984 1985 - 1992 1993 - 2000 dialogue English

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