Sizhou vs Ssu-chou

Sizhou

name
  • A subprefecture of Jiangnan, in Qing-era China 

  • A prefecture of Shanxi, in imperial China 

  • A town in Sizhou prefecture, Shanxi, in imperial China 

  • A town in Sizhou, Jiangnan, in Qing-era China 

Ssu-chou

How often have the words Sizhou and Ssu-chou occurred in a corpus of books? (source: Google Ngram Viewer )