Usage History of 'covalences'

The following chart shows how frequently 'covalences' appeared in printed materials over time. For example, the word 'covalences' occurred 8 times in books in 1921 and 8 times in 2008. From 1921 to 2008, the word 'covalences' was used a total of 1,899 times in books scanned by Google. See Reference: Google Ngram project.

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