Minnesota was the National champs in '35?

Can someone please explain this to me. I read it in this book written by SMU alum, Jim Dent. I also looked it up on several websites and Minnesota is listed as the National Champion in '35. Were we Div-IIA ??? Were we co-champions??? I don't get it. Here's a link to one site I found. This makes me think that our 1 national title isn't even legitimate although I feel that we got screwed in '82.
<A HREF="http://sharkfeet.tripod.com/pastnationalchamps.htm" TARGET=_blank>http://sharkfeet.tripod.com/pastnationalchamps.htm</A>
<A HREF="http://sharkfeet.tripod.com/pastnationalchamps.htm" TARGET=_blank>http://sharkfeet.tripod.com/pastnationalchamps.htm</A>