Usage History of 'phosphine'

The following chart shows how frequently 'phosphine' appeared in printed materials over time. For example, the word 'phosphine' occurred 2 times in books in 1800 and 4,021 times in 2008. From 1800 to 2008, the word 'phosphine' was used a total of 164,594 times in books scanned by Google. See Reference: Google Ngram project.

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