Usage History of 'coalsack'

The following chart shows how frequently 'coalsack' appeared in printed materials over time. For example, the word 'coalsack' occurred 4 times in books in 1801 and 147 times in 2008. From 1801 to 2008, the word 'coalsack' was used a total of 7,432 times in books scanned by Google. See Reference: Google Ngram project.

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