Usage History of 'firn'

The following chart shows how frequently 'firn' appeared in printed materials over time. For example, the word 'firn' occurred 2 times in books in 1658 and 1,256 times in 2008. From 1658 to 2008, the word 'firn' was used a total of 91,959 times in books scanned by Google. See Reference: Google Ngram project.

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