[math-fun] And Beano was his name-0

The web tells me that a Carl Leffler, a Columbia math prof, was contracted around 1930 to produce 6000 cards with all with unique ³Bingos², and that the effort drove him insane, despite his ultimately billing at a rate of $100/card (eg http://www.strangelife.com/bingodoc/bingohist.html). But the web says a lot of things, and my Googling only seems to churn up the same stuff‹is any of it true?