Usage History of 'spacewalks'

The following chart shows how frequently 'spacewalks' appeared in printed materials over time. For example, the word 'spacewalks' occurred 3 times in books in 1956 and 228 times in 2008. From 1956 to 2008, the word 'spacewalks' was used a total of 5,578 times in books scanned by Google. See Reference: Google Ngram project.

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