Usage History of 'seismograms'

The following chart shows how frequently 'seismograms' appeared in printed materials over time. For example, the word 'seismograms' occurred 10 times in books in 1864 and 1,730 times in 2008. From 1864 to 2008, the word 'seismograms' was used a total of 99,380 times in books scanned by Google. See Reference: Google Ngram project.

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