Abstract
IN considering progress in knowledge of the upper air during the past twenty-five years, the first point to notice is that it is roughly true that in 1910 there was little more to be learned about the condition of the atmosphere below 20 km. and a great deal to be learned about the atmosphere above that level.
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WHIPPLE, F. Progress in Knowledge of the Upper Air. Nature 135, 698–702 (1935). https://doi.org/10.1038/135698a0
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DOI: https://doi.org/10.1038/135698a0