Usage History of 'urushiols'

The following chart shows how frequently 'urushiols' appeared in printed materials over time. For example, the word 'urushiols' occurred 8 times in books in 1928 and 28 times in 2008. From 1928 to 2008, the word 'urushiols' was used a total of 969 times in books scanned by Google. See Reference: Google Ngram project.

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