Google Books Ngram Viewer

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

1800 - 1887 1888 - 1917 1918 - 1926 1927 - 1988 1989 - 2000 mail carrier English
1800 - 1839 1840 - 1911 1912 - 1921 1922 - 1983 1984 - 2000 letter carrier English
1800 - 1885 1886 - 1890 1891 - 1920 1921 - 1963 1964 - 2000 letter bearer English

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