Usage History of 'ketamines'

The following chart shows how frequently 'ketamines' appeared in printed materials over time. For example, the word 'ketamines' occurred 2 times in books in 1963 and 6 times in 2008. From 1963 to 2008, the word 'ketamines' was used a total of 135 times in books scanned by Google. See Reference: Google Ngram project.

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