Thomas Baines: an artist in the service of science in Southern Africa paintings from the collections of the Royal Geographical Society (with IBG), Royal Botanic Gardens, Kew and The Natural History Museum, London ; accompanying the exhibition held at Christies, London, 1 - 17 September 1999 - Stevenson, Michael 1966-; Baines, Thomas 1822-1875 (Christie's, 1999)