Não informado. Soviet-bloc research in geophysics, astronomy ans space. Joint Publications Research Service.
Chicago-referens (17:e uppl.)Não informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Arlington, Wash: Joint Publications Research Service.
MLA-referens (8:e uppl.)Não informado. Soviet-bloc Research in Geophysics, Astronomy Ans Space. Joint Publications Research Service.
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