From Ash Grove to St. Louis, this fine digital collection of Sanborn Fire Insurance Maps from the University of Missouri covers the Show-Me State rather nicely. These maps were used by the fire insurance companies to assess the risk of insuring a particular property, and as such, they are excellent repositories of data for urban historians, planners, architects, and others. The maps show the location of buildings, their materials, and the location of water mains, fire alarms, and the size of various structures. The digitization of these maps was supported by the Institute of Museum and Library Services, and visitors can search the entire collection of maps, or just browse around until they find something that interests them.