What kind of geese are these?

This morning as we were on our way into town we passed these geese on the side of the road. I've never seen this kind of bird around here before so I'm guessing that they might have been someone's pets and they forgot to clip their wings. but then maybe I just haven't been very observant.
but my bird book does not have then in it so they probably are not a common goose for Minnesota.

they let us get really close so I was able to get some nice decent pictures.

If you know what they are, please tell me.