back o' Bourke vs ends of the earth

back o' Bourke

name

  • An extremely remote place. 

adv

  • At or to an extremely remote place. 

ends of the earth

noun

  • Extremities of the land. 

  • A very remote place. 

  • Distant land. 

How often have the words back o' Bourke and ends of the earth occurred in a corpus of books? (source: Google Ngram Viewer )