Google Books Ngram Viewer

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

1900 - 1916 1917 - 1970 1971 - 1974 1975 - 1994 1995 - 2000 maria montessori English
1900 - 1974 1975 - 1994 1995 - 1996 1997 - 1998 1999 - 2000 paulo freire English

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