Usage History of 'noospheres'

The following chart shows how frequently 'noospheres' appeared in printed materials over time. For example, the word 'noospheres' occurred 2 times in books in 1959 and 6 times in 2008. From 1959 to 2008, the word 'noospheres' was used a total of 435 times in books scanned by Google. See Reference: Google Ngram project.

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