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Cottam, C. (1929). A shower of grebes. The Condor, 31(1), 80–81.
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Rayleigh, L. (1929). A Photoelectric Method of Measuring the Light of the Night Sky with Studies of the Course of Variation through the Night. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 124(794), 395–408.
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Strutt, R. J. (1929). A photoelectric method of measuring the light of the night sky with studies of the course of variation through the night. Proc. R. Soc. Lond. A, 124(794), 395–408.
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