As a Certified Math Blogger I sometimes get new popular math books in the mail. I just got one from Basic Books, opened to a random page, and found a reference to “Euclidian geometry.” Yes, I know this is an arguably acceptable alternative spelling. But it’s “Euclidean” everywhere else in the book.
(The typo is on p.47, if the self-Googlers at Basic should happen to read this.)
Quomodocumque 
One could pose the same question about the Bulletin of the AMS…. (50.1 p.9)