Piedmont vs Riverbank

Piedmont

name
  • A city in Alameda County, California, United States. 

  • A region in the north of Italy. 

  • The region of the eastern US between the Appalachian mountains and the coastal plain, extending from eastern Alabama to northern New Jersey. 

Riverbank

name
  • A city in Stanislaus County, California, United States. 

How often have the words Piedmont and Riverbank occurred in a corpus of books? (source: Google Ngram Viewer )