Usage History of 'airglows'

The following chart shows how frequently 'airglows' appeared in printed materials over time. For example, the word 'airglows' occurred 4 times in books in 1953 and 22 times in 2008. From 1953 to 2008, the word 'airglows' was used a total of 484 times in books scanned by Google. See Reference: Google Ngram project.

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