Google Books Ngram Viewer

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

1800 - 1938 1939 - 1990 1991 - 1996 1997 - 2001 2002 - 2008 racial equality English
1800 - 1825 1826 - 1959 1960 - 1975 1976 - 1992 1993 - 2008 equality English
1800 - 1860 1861 - 1865 1866 - 1868 1869 - 1957 1958 - 2008 negro equality English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer