Google Books Ngram Viewer

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

1800 - 1859 1860 - 1997 1998 - 2000 2001 - 2004 2005 - 2008 academic labour English
1800 - 1957 1958 - 1998 1999 - 2002 2003 - 2004 2005 - 2008 academic labor English

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