Usage History of 'ecotone'

The following chart shows how frequently 'ecotone' appeared in printed materials over time. For example, the word 'ecotone' occurred 10 times in books in 1904 and 2,338 times in 2008. From 1904 to 2008, the word 'ecotone' was used a total of 76,706 times in books scanned by Google. See Reference: Google Ngram project.

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