Here are the images of the fire(s)...it is the 1904 fire that is being sung about. http://www.mdhs.org/library/Z24BaltFires.html

And yes, I was in the group that heard Becky Kimmons sing, and her version was really wonderful. She is only the 2nd one I have heard do that 'missing' verse...it was great to add to out collective knowlege.