Google Books Ngram Viewer

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

1800 - 1873 1874 - 1914 1915 - 1923 1924 - 1975 1976 - 2000 fireman English
1800 - 1974 1975 - 1995 1996 - 1997 1998 1999 - 2000 firefighter English

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