Google Books Ngram Viewer

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

1800 - 1846 1847 - 1861 1862 - 1911 1912 - 1974 1975 - 2000 serf English
1800 - 1812 1813 - 1862 1863 - 1877 1878 - 1954 1955 - 2000 drudge English

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