Google Books Ngram Viewer

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

1920 - 1940 1941 - 1950 1951 - 1955 1956 - 2000 2001 - 2008 gadget English
1920 - 1959 1960 - 1996 1997 - 2000 2001 - 2004 2005 - 2008 international development English
1920 - 1967 1968 - 1987 1988 - 1990 1991 - 2003 2004 - 2008 medical technology English
1920 - 1977 1978 - 1983 1984 - 1985 1986 - 1999 2000 - 2008 appropriate technology English

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