burgh vs county seat

burgh

noun
  • a borough or chartered town (now only used as an official subdivision in Scotland). 

  • a small mound, often used in reference to tumuli (mostly restricted to place names). 

county seat

noun
  • The city in which the offices of county government are located. 

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