Prairie du Chien vs Steelville

Prairie du Chien

name

  • A city, the county seat of Crawford County, Wisconsin, United States. 

  • A town in Crawford County, Wisconsin, which includes part of the city. 

Steelville

name

  • A city, the county seat of Crawford County, Missouri, United States. 

How often have the words Prairie du Chien and Steelville occurred in a corpus of books? (source: Google Ngram Viewer )