Searching mg banns

I learned the following when consulting with a volunteer at my local FHC and am posting it in the hopes that it may be of use to others. If the Catholic marriage was of two people of different parishes, the banns would need to be posted in each church where each was then living. The banns wouldn't necessarily indicate in which church the marriage took place, and, of course, it could be in a parish where neither actually resided, but it was most likely in the woman's. The banns do indicate the parished involved. While this means ordering of even more films, maybe by hunting through both mg records and mg information records I can find some elusive marriages that are not in the IGI and not where the kids are born. I also learned that, if uncontested, the mg usually took place 3 weeks after the last bann.