photocopy vs plaster cast

photocopy

noun
  • A copy made using a photocopier. 

verb
  • To make a copy using a photocopier. 

plaster cast

noun
  • A copy of a piece of art or other object cast in plaster. 

  • A cast made of a stiff material (often plaster of Paris and gauze) in order to immobilize a broken bone for the period of healing. 

How often have the words photocopy and plaster cast occurred in a corpus of books? (source: Google Ngram Viewer )