text: A brief history of paper models | Paper Model Toy
  During WWII, all materials were in short supply. Those that were available had restricted use. Obviously, toys were at the bottom of the list. These restrictions ruled out metal toys - wood and paper were about all that was available. The U.S. toymakers switched to toys and games that used paper and other nonstrategic materials. Even here, shortages of printing ink lead to some rather bizarre-colored paper models.
  Ref : http://www.ece.cmu.edu/~koopman/airplanes/history.html
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