Usage History of 'introgressive'

The following chart shows how frequently 'introgressive' appeared in printed materials over time. For example, the word 'introgressive' occurred 2 times in books in 1848 and 336 times in 2008. From 1848 to 2008, the word 'introgressive' was used a total of 11,549 times in books scanned by Google. See Reference: Google Ngram project.

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