[1]Heligoland as an Ornithological Observatory, p. 151, et seq.
[2]Dictionary of Birds, p. 712.
[3]Dictionary of Birds, p. 774.
[4]Dictionary of Birds, p. 399.
[5]Ray, English Words, p. 74.
[6]Ibis, 1870, p. 301.
[7]Icebound on Kolguev, p. 43.
[8]The Migration of Birds; The Migration of British Birds; Heligoland an Ornithological Observatory.
PLYMOUTH:
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PRINTERS.