The map I picked as one of the most important for librarians and information professionals to understand is the 'Recent Environmental Controversies' map on page 59 in the Land and Economy section. The reason I decided on this map is because this gives insight into how the area is changing, as opposed to a selection that shows how the area has changed - which would also help to map changes up ahead. In regard to how this can change a collection, the map gives the librarian an idea of what problems or issues will be of most interest in a certain area and can then acquire information accordingly. With the big fluctuation in temperatures and global warming on everyone's mind, including Al Gore's, interest in the changing environment is increasing - or should. The text that goes with the map also helps the information professional to place the map in context: WI is a leader in environmental concerns, which means other states are worse.