Google Books Ngram Viewer

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

1800 - 1847 1848 - 1908 1909 - 1918 1919 - 1969 1970 - 2000 germ English
1800 - 1904 1905 - 1913 1914 - 1920 1921 - 1988 1989 - 2000 bacteria English
1800 - 1911 1912 - 1981 1982 - 1987 1988 - 1993 1994 - 2000 virus English

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