Welcome to the UFO magazine forum, Adam133.
Minnesota has had many unexplained phenomena in the past, and if you check out Amazon and other book sites you will find many books on that subject. (Then go check them out at the library, or have the library order them for you to read.)
There is much out there on the subjects at hand, and keeping an open mind is a good thing. But one must also question all of it, as there are many charlatans and hoaxers out there too.