The collection, assembled by the rare book dealers Jenny Allsworth and Humphrey Winterton, brings together photographs, photograph albums, glass lantern slides, and a lantern projector, which document the Sultanate of Zanzibar and European colonial expansion in East and Central Africa from 1870 to 1914. Also documented are early Arab and Portuguese coastal settlements at Kilwa, Mafia, Pemba, Sofala, and Zanzibar. The collection also represents the work of certain photographers who operated in different parts of the region, including C. Vicente of Dar es Salaam, Coutinho Brothers of Zanzibar and Dar es Salaam, P. De Lord Brothers of Zanzibar and Dar es Salaam, Walther Dobbertin, and A. C. Gomes & Co. of Zanzibar, among others.