Usage History of 'doula'

The following chart shows how frequently 'doula' appeared in printed materials over time. For example, the word 'doula' occurred 4 times in books in 1763 and 3,330 times in 2008. From 1763 to 2008, the word 'doula' was used a total of 50,285 times in books scanned by Google. See Reference: Google Ngram project.

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