Usage History of 'isohyetal'

The following chart shows how frequently 'isohyetal' appeared in printed materials over time. For example, the word 'isohyetal' occurred 4 times in books in 1852 and 169 times in 2008. From 1852 to 2008, the word 'isohyetal' was used a total of 13,933 times in books scanned by Google. See Reference: Google Ngram project.

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