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A singularly marked Specimen of <I>Sphyropicus thyroideus</I>

Ridgway, Robert (1887)
[Reply to Dr. J. G. Cooper's article entitled "The Water Birds of North America, Explanations," in The Auk, III, 1886, pp. 401,402.]

Ridgway, Robert (1886)
Description of a new genus of <I>Oceanitido</I>

Ridgway, Robert (1886)
Descriptions of a new species of Elf Owl from Socorro Island, western Mexico

Ridgway, Robert (1886)
On the Glaucous Gull of Bering Sea and contiguous waters

Ridgway, Robert (1886)
Letter addressed to the Editors of "The Ibis" in regard to the Breeding Plumage of <I>Colymbus occidentalis</I>

Ridgway, Robert (1887)
A new pigeon from Jamaica

Ridgway, Robert (1915)
Shufeldt on the anatomy of Humming Birds and Swifts

Ridgway, Robert (1892)
Diagnosis of a new genus of buteonine hawks (Coryornis, gen. nov.)

Ridgway, Robert (1925)
The Imperial Woodpecker (<I>Campephilus imperialis</I>) in northern Sonora

Ridgway, Robert (1887)

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- Ridgway, Robert (251)
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