If you read both articles, I think you'll find that someone coded a 'General Motors Research' article for just the Michigan sites; the one with the DMR in the title encompasses the entire system (including NY and Tennessee). So I simply bound the two together since they seem to describe the same system, but a set of sites in another state. Evidently there was a time when the site was described sans the DMR in the title, hence the confusion.
If you're going to drop the one that doesn't have the DMR in the title, just copy all the bandplan links over and be sure to drop the link in the Michigan Trunking systems table. That should just about do it
Mike