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Author  |
Title | Year | Publication | Volume | Pages |
|---|---|---|---|---|---|
| Cottam, C. | A shower of grebes | 1929 | The Condor | 31 | 80-81 |
| Rayleigh, L. | A Photoelectric Method of Measuring the Light of the Night Sky with Studies of the Course of Variation through the Night | 1929 | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences | 124 | 395-408 |