Google Books Ngram Viewer

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

1900 - 1944 1945 - 2002 2003 - 2004 2005 - 2006 2007 - 2008 motor neuron English
1900 - 1919 1920 - 2000 2001 - 2002 2003 - 2004 2005 - 2008 motor neurons English
1900 - 1949 1950 - 1968 1969 - 1971 1972 - 2001 2002 - 2008 motor neurone English
1900 - 1930 1931 - 1970 1971 - 1975 1976 - 1997 1998 - 2008 motor neurones English

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