The Birds of Africa. (Volume I). Fourth printing 1997. Leslie H.Brown. Emil K. Urban. Kenneth Newman. Illustrated by Martin Woodcock and Peter Hayman. Advisory Editorial Board C. H. Fry. G. S. Keith. Foreword by HRH the Duke of Edinburgh. (Volume II). Second printing 1993. Edited by Emil K. Urban. C. Hilary Fry. Stuart Keith. Colour plates by Martin Woodcock. Line drawings by Ian Willis. Acoustic