Usage History of 'protoxides'

The following chart shows how frequently 'protoxides' appeared in printed materials over time. For example, the word 'protoxides' occurred 6 times in books in 1801 and 301 times in 2008. From 1801 to 2008, the word 'protoxides' was used a total of 9,330 times in books scanned by Google. See Reference: Google Ngram project.

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