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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=knowledge+of,+knowledge+on,+knowledge+about&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1;,knowledge%20of;,c0;.t1;,knowledge%20on;,c0;.t1;,knowledge%20about;,c0" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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Part-of-speech tags
cook_VERB, _DET_ President _PROPN_
Wildcards
King of *, best *_NOUN
Inflections
shook_INF drive_VERB_INF
Arithmetic compositions
(color /(color + colour))
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2022
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Search in Google Books
knowledge of
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1500 - 1575
1576 - 1605
1606 - 1810
1811 - 1949
1950 - 2022
English
knowledge on
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1500 - 1807
1808 - 1882
1883 - 1903
1904 - 2006
2007 - 2022
English
knowledge about
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1500 - 1923
1924 - 2007
2008 - 2012
2013 - 2017
2018 - 2022
English