Google Books Ngram Viewer

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

1920 - 1997 1998 - 2006 2007 - 2006 2007 2008 global south English
1920 - 1952 1953 - 1996 1997 - 1999 2000 - 2002 2003 - 2010 fourth world English
1920 - 1956 1957 - 1963 1964 - 1965 1966 - 1981 1982 - 2010 underdeveloped countries English
1920 - 1970 1971 - 1984 1985 - 1987 1988 - 2000 2001 - 2010 developing countries English
1920 - 1975 1976 - 1987 1988 - 1989 1990 - 2000 2001 - 2010 third world English
1920 - 1945 1946 - 1990 1991 - 1995 1996 - 2001 2002 - 2010 industrialized English

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