...The bases of the greater coverts,however, are black, this generally breaking thewhite mirror as it is called... 
Chester A. Reed 「The Bird Book」
...The bird differs from the Black Guillemotonly in having the bases of the coverts whitealso...
Chester A. Reed 「The Bird Book」
...Upper tail coverts,bases of tail feathers, under wing coverts,and abdomen, white...
Chester A. Reed 「The Bird Book」
...This strikingly marked Duck is twenty inchesin length, has a green head and speculum, bluewing coverts and chestnut belly...
Chester A. Reed 「The Bird Book」
...This bird, with its broad, flat bill, bare head, and rosy plumage with carmineepaulets and tail coverts, seem more like the fanciful creation of some artistthan a real bird of flesh and blood...
Chester A. Reed 「The Bird Book」
...This species is of the size of the last butis blackish (darkest on the head and breast),with a white belly and undertail coverts, the latter streakedwith dusky...
Chester A. Reed 「The Bird Book」
...These are dull and yellowish birds, shading to brownishon the head; with a bright yellow forehead and susperciliaryline, black wings and tail, and white inner secondariesand greater coverts...
Chester A. Reed 「The Bird Book」
...Smaller than the last twospecies and deep blue, withwings and tail blackish, andthe lesser coverts and tips ofgreater, chestnut...
Chester A. Reed 「The Bird Book」
...Similar to the preceding, but with the forehead and ear coverts black...
Chester A. Reed 「The Bird Book」
...Crown and ear coverts black, underpartsand line over eye yellow;no white in the plumage...
Chester A. Reed 「The Bird Book」
...Above dusky black; below white; sidesof breast grayish; under tail coverts dusky brown; bill black...
Frank M. Chapman 「Color Key to North American Birds」
...Above sooty brown; back of neck and uppertail coverts white; base of tail white...
Frank M. Chapman 「Color Key to North American Birds」
...Sooty black, brownerbelow; upper tail coverts white, tipped with black...
Frank M. Chapman 「Color Key to North American Birds」
...Webs of feet with yellowpatch: tail not forked; longer upper tail coverts nottipped with black...
Frank M. Chapman 「Color Key to North American Birds」
...Base of tail and longer uppertail-coverts white, shorter coverts and all back blackishbrown; white in wings conspicuous in flight...
Frank M. Chapman 「Color Key to North American Birds」
...Entire upperparts, cheeks, tail,wings and breast-band black; bases of wing-feathers,tips to coverts and underparts, except breast-band,whitish...
Frank M. Chapman 「Color Key to North American Birds」
...They seldom quittheir coverts during the day, but prowl about in search of food duringtwilight and the night...
Robert Jennings 「Sheep, Swine, and Poultry」
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