The Poltergeists of Pottawattamie County.

For the believer, proof is not necessary.  For the non-believer, proof is not possible.

There are times not all of an area's history can be fully explained by listing its famous people and significant dates.  There's that other side that many would like to pretend doesn't exist.  Whether such phenomena are fact or products of over-active imaginations shouldn't matter to a historian.  What is a fact is that some people believed it.  And that makes it part of our history, skeptic or not!