Observadores

• 

  Leland Slack

  https://nanumhub.com/%EC%A0%84%EB%AC%B8-%EC%B9%B4%EC%A7%80%EB%85%B8%EC%82%AC%EC%9D%B4%ED%8A%B8-%EA%B2%80%EC%A6%9D%EC%9D%98-%EC%A4%91%EC%9A%94%EC%84%B1%EA%B3%BC-%EB%B0%A9%EB%B2%95/