"Fauna. Zoölogische determinatiewerken." . . "Strigiformes." . . "Taxonomie (Biologie)" . . "Owls." . . "Eulenvögel." . . "Eulen (Vögel)" . . "Lechuzas." . . "Aufsatzsammlung." . . "Hiboux." . . . . "Owls" . . . "Owls of the world their evolution, structure, and ecology"@en . "Owls of the world : Their evolution, structure and ecology : [ By] Philip Burton (o.fl.a.)" . . . . . . . . "Owls of the world; their evolution, structure and ecology. Illustrated by John Rignall. Edited by John A. Burton. Contributors Philip Burton and others"@en . . . "Owls of the world : Their evolution, structure and ecology. Illustr. by John Rignall" . . . . . . . . . . . . . . . . "Handbuch" . . . "Owls of the world their evolution, structure and ecology"@en . "Owls of the world their evolutionm structure and ecology" . . . . . "Owls of the World" . "Owls of the world; their evolution, structure, and ecology" . "Owls of the world; their evolution, structure, and ecology"@en . . . . "Owls of the world, their evolution, structure and ecology" . "Owls of the world : their evolution, structure, and ecology" . . . . . . . . . . . "Owls of the world; their evolution, structure and ecology" . . . . . . . "Owls of the world : their evolution, structure and ecology"@en . "Owls of the world : their evolution, structure and ecology" . . . . "Owls of the world"@en . . "Vogels." . .