Docs For Old Oscilloscopes?

Dan Olson asks: "I recently became the owner of a RCA WO-91B Oscilloscope, and it did not come with a manual. Does anybody have any idea where I could come by one?" Oscilloscopes are one of those geeky things that usually pop up in auctions, old electronic shops and other random surplus outlets. Surely many of us have seen one, simply couldn't resist, and bought it, only to find that it was too difficult to operate without a manual? For those of you in this situation, what did you do? Throw it in the storage unit and forget it even existed, or were you able to at least find some information to make it usable? If you were able to do the latter, what sources did you use?