Rockhill vs Rockhill Furnace

Rockhill

name

  • A borough in Huntingdon County, Pennsylvania, United States. 

  • An unincorporated community in Collin County, Texas, United States. 

  • A surname. 

  • A hamlet in Clun parish, Shropshire, England (OS grid ref SO2879). 

Rockhill Furnace

name

  • Synonym of Rockhill, Huntingdon County, Pennsylvania. 

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