Usage History of 'isopach'

The following chart shows how frequently 'isopach' appeared in printed materials over time. For example, the word 'isopach' occurred 2 times in books in 1893 and 722 times in 2008. From 1893 to 2008, the word 'isopach' was used a total of 51,471 times in books scanned by Google. See Reference: Google Ngram project.

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