...Call, an explosive quab; song, a soft coo repeatedfour or five times... 
Frank M. Chapman 「Color Key to North American Birds」
...A softly whistled coo repeatedmany times at intervals of about one second...
Frank M. Chapman 「Color Key to North American Birds」
...Brent, besides its peculiar note, used to coo in a singular and pleasing manner, which, independently, struck both Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The note of this dove is exceedinglyplaintive, and is softer, but much resembles the coo of the turtle-dove...
Charles Sturt 「Expedition into Central Australia」
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coign spindles personnel
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