Usage History of 'rucksacks'

The following chart shows how frequently 'rucksacks' appeared in printed materials over time. For example, the word 'rucksacks' occurred 4 times in books in 1853 and 2,936 times in 2008. From 1853 to 2008, the word 'rucksacks' was used a total of 70,603 times in books scanned by Google. See Reference: Google Ngram project.

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