Google Books Ngram Viewer

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

1800 - 1850 1851 - 1914 1915 - 1923 1924 - 1971 1972 - 2000 seeing visions English
1800 - 1874 1875 - 1976 1977 - 1985 1986 - 1994 1995 - 2000 having visions English

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