Usage History of 'ionosondes'

The following chart shows how frequently 'ionosondes' appeared in printed materials over time. For example, the word 'ionosondes' occurred 2 times in books in 1955 and 331 times in 2008. From 1955 to 2008, the word 'ionosondes' was used a total of 4,350 times in books scanned by Google. See Reference: Google Ngram project.

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