Usage History of 'dropsonde'

The following chart shows how frequently 'dropsonde' appeared in printed materials over time. For example, the word 'dropsonde' occurred 6 times in books in 1946 and 152 times in 2008. From 1946 to 2008, the word 'dropsonde' was used a total of 3,357 times in books scanned by Google. See Reference: Google Ngram project.

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