Usage History of 'backfill'

The following chart shows how frequently 'backfill' appeared in printed materials over time. For example, the word 'backfill' occurred 6 times in books in 1869 and 8,653 times in 2008. From 1869 to 2008, the word 'backfill' was used a total of 270,979 times in books scanned by Google. See Reference: Google Ngram project.

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