Usage History of 'theophyllines'

The following chart shows how frequently 'theophyllines' appeared in printed materials over time. For example, the word 'theophyllines' occurred 1 time in books in 1926 and 171 times in 2008. From 1926 to 2008, the word 'theophyllines' was used a total of 9,425 times in books scanned by Google. See Reference: Google Ngram project.

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