| H-alpha synoptic charts of solar activity for the period of Skylab observations May, 1973-March, 1974 - :1031 | National Environmental Satellite and Data Information Service (NESDIS)
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H-alpha synoptic charts of solar activity for the period of Skylab observations May, 1973-March, 1974
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H-alpha synoptic charts of solar activity for the period of Skylab observations May, 1973-March, 1974
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