Oxford New American dictionary (on my Mac): ty·pog·ra·phy Random House College dictionary (print): ty·pog·ra·phy Merriam-Webster (online, the print edition is

Oxford New American dictionary (on my Mac): ty·pog·ra·phy Random House College dictionary (print): ty·pog·ra·phy Merriam-Webster (online, the print edition is what the TUG hyphenation exception list uses as its definitive authority): ty· pog· ra· phy I published a typography magazine in the late 1990s, and never once heard a single person, American or otherwise, pronounce it the way Cambridge claims Americans do.