Google Books Ngram Viewer

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

1800 - 1874 1875 - 1902 1903 - 1910 1911 - 1965 1966 - 1975 anaesthesia English
1800 - 1910 1911 - 1956 1957 - 1961 1962 - 1967 1968 - 1975 anesthesia English
1800 - 1881 1882 - 1920 1921 - 1927 1928 - 1964 1965 - 1975 perfunctorily English

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