Usage History of 'holotypes'

The following chart shows how frequently 'holotypes' appeared in printed materials over time. For example, the word 'holotypes' occurred 2 times in books in 1898 and 116 times in 2008. From 1898 to 2008, the word 'holotypes' was used a total of 8,664 times in books scanned by Google. See Reference: Google Ngram project.

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