Keywords: Ptyonoprogne concolor 1894.jpg Dusky Crag Martin Hirondelle concolore http //archive org/stream/monographofhirun02sha page/n45/mode/2up A monograph of the Hirundinidae creator Richard Bowdler Sharpe 1894 PD-old-100 Ptyonoprogne concolor Richard Bowdler Sharpe A monograph of the Hirundinidae |