Google Books Ngram Viewer

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

1800 - 1928 1929 - 1949 1950 - 1955 1956 - 1988 1989 - 2000 john dewey English
1800 - 1926 1927 - 1930 1931 - 1933 1934 - 1988 1989 - 2000 helen parkhurst English
1800 - 1941 1942 - 1988 1989 - 1993 1994 - 1996 1997 - 2000 rudolf steiner English

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