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  1. 1
    由 Elder, Donald C., 1952-
    出版 1995
    主题 “...Artificial satellites in telecommunication United States History....”
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    Out from behind the eight-ball : a history of Project Echo /
  2. 2
    由 Bhatt, S. C.
    出版 1994
    主题 “...Artificial satellites in telecommunication India History....”
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    Satellite invasion of India /

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