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The brief accounts of subspecific variation and distribution ranges are based largely on the author's own assessment of large quantities of museum specimens
5 x 10 mm inside diameter Incoloy (hard) metal rings
9 The Joys of Patch Birding Maria Scullion
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Guillemot Special Rings Pack of::100 The brief accounts of subspecific** Please use the drop down menu above to select the quantity of rings that you require** 5 x 10 mm inside diameter Incoloy (hard) metal rings. A specially shaped ring to prevent turning on the leg. Limited quantities of these rings are available free. Applications for these should be made by the start of January to sales@bto. org. This product will only be sold and shipped to appropriately licensed BTO ringing permit holders. C permit holders: please
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