Keywords: BucerosSubcylindricusKeulemans.jpg Buceros subcylindricus Bycanistes subcylindricus Proceedings of the Zoological Society of London 1870 http //www archive org/stream/proceedingsofgen70zool page/n770/mode/1up web 1870 J G Keulemans pd-old-70 John Gerrard Keulemans PZSL 1870 Bycanistes subcylindricus |