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of the natural environment. Ivanov's mission was focused primarily on space physics, communications and environmental studies. In December 1978, Spektar-15, a Bulgarian-made spectrometric system, was installed on the Salyut 6 training mock-up at Yuri Gagarin Cosmonaut Training Center. It was subsequently approved for space use. Elements of the Spektar-15 were delivered to Salyut 6 on 14 March 1979 with the Progress 5

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