Usage History of 'claypan'

The following chart shows how frequently 'claypan' appeared in printed materials over time. For example, the word 'claypan' occurred 6 times in books in 1875 and 374 times in 2008. From 1875 to 2008, the word 'claypan' was used a total of 13,921 times in books scanned by Google. See Reference: Google Ngram project.

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