calf vs kid leather

calf

noun
  • Leather made of the skin of the calf; especially, a fine, light-coloured leather used in bookbinding. 

  • A chunk of ice broken from a larger glacier, ice shelf, or iceberg. 

  • A cabless railroad engine. 

  • The back of the leg below the knee. 

  • A young cow or bull. 

  • A young deer, elephant, seal, whale or giraffe (also used of some other animals). 

  • The muscle in the back of the leg below the knee. 

  • A small island, near a larger island. 

kid leather

noun
  • Leather made from the skin of a young goat. 

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