Usage History of 'lightships'

The following chart shows how frequently 'lightships' appeared in printed materials over time. For example, the word 'lightships' occurred 2 times in books in 1816 and 1,074 times in 2008. From 1816 to 2008, the word 'lightships' was used a total of 42,440 times in books scanned by Google. See Reference: Google Ngram project.

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