Usage History of 'rubidiums'

The following chart shows how frequently 'rubidiums' appeared in printed materials over time. For example, the word 'rubidiums' occurred 1 time in books in 1892 and 2 times in 2003. From 1892 to 2003, the word 'rubidiums' was used a total of 163 times in books scanned by Google. See Reference: Google Ngram project.

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