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Northern Harrier
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Circus cyaneus
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Northern Harrier. North of Elkhorn Slough, Central California. By Blake Matheson.
Circus cyaneus. Hen Harrier
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Machrie Moor, Isle of Arran. NR950304
Circus cyaneus
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Hen Harrier. Circus cyaneus
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Hen Harrier male - Circus cyaneus
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Loch Druidibeag, South Uist, Outer Hebrides
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The human side of birds,.New York,Frederick A. Stokes company[c1917].
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Hen Harrier .Circus cyaneus
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Hen Harrier .Circus cyaneus
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Circus approximans
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Circus approximans
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Circus approximans
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Circus approximans
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Birds and nature..Chicago, Ill. :A.W. Mumford, Publisher,1900-1907..
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Report on the birds of Pennsylvania..Harrisburg,E.K. Meyers, State Printer,1888..
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The Vari, or Cinereous Harrier in Chubut Province of Patagonian Argentina.
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Coloured figures of the birds of the British Islands. v.1London :R. H. Porter,1885-1897.
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Circus pygargus
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Montagu's Harrier. On the Plains of Santa Marta de Magasca. By Blake Matheson.
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The birds of Australia..London,Printed by R. and J. E. Taylor; pub. by the author,[1840]-48..
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Ornithological miscellany V.2London :Trbner and Co., Bernard Quaritch, R.H. Porter,1876-1878.
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