I got stuck a the library one day waiting my turn for the tech person. I know, stuck in the library. Such a problem! I picked this book from a display thinking I would I would find some fun ghost stories. Unfortunately, the authors chose quantity over quality. Most of the ghost stories were very brief as were their investigations.
For example, there is a resort in Manitowish Waters called Little Bohemia. It was a vacation spot of Chicago gangsters such as John Dillinger and Al Capone during Prohibition. There actually was an incident there when the feds were tipped off about there location and they showed up. Unfortunately, some innocent bystanders were the first to walk out, not knowing what was going on. The Feds opened fire, and they were shot, and one was killed. The gangsters escaped.
As this is a true incident, they certainly could have included dates and they did not.
In other stories, the hauntings as just vague. There are creaky sounds in a 100 year old bar you only hear after closing time. Well, old buildings make noise, and you cannot hear them over loud bar music and bar patrons.