Usage History of 'sourceless'

The following chart shows how frequently 'sourceless' appeared in printed materials over time. For example, the word 'sourceless' occurred 2 times in books in 1821 and 418 times in 2008. From 1821 to 2008, the word 'sourceless' was used a total of 14,000 times in books scanned by Google. See Reference: Google Ngram project.

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