Google Books Ngram Viewer

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

1800 - 1831 1832 - 1863 1864 - 1875 1876 - 1967 1968 - 2000 a half a mile English
1800 - 1825 1826 - 1862 1863 - 1878 1879 - 1980 1981 - 2000 a half an hour English

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