Google Books Ngram Viewer

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

1920 - 1960 1961 - 1997 1998 1999 2000 european union English
1920 - 1978 1979 - 1997 1998 1999 2000 palestinian authority English
1920 - 1954 1955 - 1963 1964 - 1967 1968 - 1995 1996 - 2000 north atlantic treaty organization English

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