Google Books Ngram Viewer

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

1776 - 1922 1923 - 1982 1983 - 1990 1991 - 1998 1999 - 2008 economics English
1776 - 1827 1828 - 1883 1884 - 1896 1897 - 1994 1995 - 2008 political economy English

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