GOULD, John (1804-1881). R. Bowdler SHARPE. A Monograph of the Trochilidae, or Family of Hummingbirds. London: published by the author, [1849]-1861; Henry Sotheran & Co., 1887.
![GOULD, John (1804-1881). R. Bowdler SHARPE. A Monograph of the Trochilidae, or Family of Hummingbirds. London: published by the author, [1849]-1861; Henry Sotheran & Co., 1887.](http://cdn.shopify.com/s/files/1/1156/7956/products/Spines_1080x.jpg?v=1618346811)
![GOULD, John (1804-1881). R. Bowdler SHARPE. A Monograph of the Trochilidae, or Family of Hummingbirds. London: published by the author, [1849]-1861; Henry Sotheran & Co., 1887.](http://cdn.shopify.com/s/files/1/1156/7956/products/Spines_580x.jpg?v=1618346811)