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Aurora : the Northern lights in mythology, history and science | Bok | 551.594 F Falck-Ytter, Harald / - Edinburgh : Floris Books, 1999. - 143 s. - Språk: Engelsk | Falck-Ytter, Harald | 1999 |
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Herodotus 4.42, the sun direction | Analytt | 386(091)(05) M Kahanov, Yaacov / I: The Mariner's Mirror. - No.1, 2000 - London, 2000. - s.66-72 | Kahanov, Yaacov | 2000 |
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Tidebølger og flekker på solen | Bok | q525.6 M Meldahl, K. G. / - Oslo, 1932. - 12 s. | Meldahl, K. G. | 1932 |