Usage History of 'subsurface'

The following chart shows how frequently 'subsurface' appeared in printed materials over time. For example, the word 'subsurface' occurred 2 times in books in 1600 and 52,847 times in 2008. From 1600 to 2008, the word 'subsurface' was used a total of 1,495,086 times in books scanned by Google. See Reference: Google Ngram project.

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