Iowa vs north forty

Iowa

noun

  • One of the Native Americans formerly occupying the region now included in the state of Iowa. 

name

  • A town in Calcasieu Parish, Louisiana. 

  • A tributary of the Mississippi River which flows through Iowa in a southeast direction. 

  • University of Iowa. 

  • A state in the Midwestern region of the United States. Capital and largest city: Des Moines. 

north forty

noun

  • A 40-acre section of land, located in the northernmost part of a farm or ranch. 

  • Any remote place. 

  • Farms, ranches, or agricultural land collectively. 

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