1906 "The Postage Stamps, Envelopes, Wrappers, Post Cards and Telegraph Stamps. The British Colonies, Possessions and Protectorates in Africa. Part III Comprising New Republic, Northern Nigeria, Oil Rivers and Niger Coast Protectorate, Orange River Colony with Orange Free State, St. Helena, Seychelles, Sierra Leone, Southern Nigeria, Stellaland, Swaziland, The Transvaal with South African Republic, Uganda, Zanzibar and Zululand.." The Philatelic Society, London, 247 pp., paper wraps (chipped at edge and cracked spine held by few threads with intact text block but will need rebinding or very gentle use). A foundational resource of information for the specialist.