Ah, it's worse than that. I've documents, manuals and books so old that the text is obviously from the ancient kind of typewriter that saved numeric keys, didn't have One or Zero only 2 to 9.
Then some publishers didn't spot this on the proofing so stuff can be type set with I or l for 1 and O for 0.
I don't much fancy correcting OCR anyway unless I have the original, and even then I think I'd rather someone else did it.
