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| Issue Date | Title | Author(s) |
|---|---|---|
| May-1908 | Helium absorption in the Sun | Evershed, John |
| Dec-1912 | Distribution in latitude of the absorption markings in Hα spectroheliograms | Royds, T |
| Jun-1911 | The absorption markings in Hα spectroheliograms | Royds, T |