"Nothing specific, but the librarian—he comes from a line of librarians; apparently it’s a family thing—said that Quin was bursting at the seams according to the oral history. Let’s say ten billion, just to throw out a number. That’s ten people per mile in Heaven’s River. Give a city control of a fifty mile stretch of river, and that’s five hundred people. A little low, but maybe the population has expanded over the last, uh, somewhere between one and five hundred years."