Observadores

• 

  Irvin Mullin

  https://alsugati.com/%ED%95%B4%EC%99%B8-%EC%98%A8%EB%9D%BC%EC%9D%B8%EC%B9%B4%EC%A7%80%EB%85%B8-%EC%82%AC%EC%9D%B4%ED%8A%B8-%EC%8B%A0%EB%A2%B0%EC%84%B1%EA%B3%BC-%EC%9C%A0%EC%9A%A9%EC%84%B1%EC%9D%98-%EC%A1%B0%ED%99%94/