Usage History of 'rockhounding'

The following chart shows how frequently 'rockhounding' appeared in printed materials over time. For example, the word 'rockhounding' occurred 2 times in books in 1952 and 626 times in 2008. From 1952 to 2008, the word 'rockhounding' was used a total of 7,720 times in books scanned by Google. See Reference: Google Ngram project.

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