Abstract
THE following may not throw light upon the scarcity of swallows in England this year, as noted in NATURE of July 14, p. 628, but will explain a shortage in another part of the world, and may be of interest and suggestive.
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PRIDE, A. Scarcity of Swallows. Nature 107, 779 (1921). https://doi.org/10.1038/107779b0
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DOI: https://doi.org/10.1038/107779b0
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