Usage History of 'lignitic'

The following chart shows how frequently 'lignitic' appeared in printed materials over time. For example, the word 'lignitic' occurred 6 times in books in 1835 and 326 times in 2008. From 1835 to 2008, the word 'lignitic' was used a total of 37,871 times in books scanned by Google. See Reference: Google Ngram project.

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