Usage History of 'testcrossing'

The following chart shows how frequently 'testcrossing' appeared in printed materials over time. For example, the word 'testcrossing' occurred 2 times in books in 1940 and 25 times in 2008. From 1940 to 2008, the word 'testcrossing' was used a total of 1,381 times in books scanned by Google. See Reference: Google Ngram project.

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