Google Books Ngram Viewer

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

1800 - 1967 1968 - 1978 1979 1980 - 1998 1999 - 2000 ilr school English
1800 - 1950 1951 - 1963 1964 1965 - 1990 1991 - 1995 industrial and labor relations school English

Run your own experiment! Raw data is available for download here.
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