Abstract
I SHOULD esteem it a favour if the writer of the review of Ralfe's “Birds of the Isle of Man” (NATURE, May 31, p. 195) would more clearly explain his reference to the dimorphic forms of Corvus cornix and C. corone, and the “border-line, i.e. along the line from the Firth of Clyde to the Adriatic, &c.”
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HARVIE-BROWN, J. Distribution of the Forms of Corvus cornix and C. corone. Nature 74, 175 (1906). https://doi.org/10.1038/074175b0
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DOI: https://doi.org/10.1038/074175b0
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