Apparently the term 'blue moon' used to refer to a second blue moon in a month was used (maybe colloquially) as far back as 1946. There is an unconfirmed report of it being Czechoslovakian in origin.
Info source: Sky and Telescope magazine
http://www.skypub.com/sights/moonplanets/mar99bluemoon.html
philip.hibbs_at_tnt.co.uk
http://www.snark.freeserve.co.uk/
Failure is not an option, it's integral to the o/s.
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