Ngorongoro Conservation Area : aerial survey of livestock and wildlife, 23-25 October 1987 : preliminary results of SRF survey Author(s) Perkin, Scott Campbell, Kenneth L.
Environmental monitoring in the Serengeti and Ngorongoro regions of Tanzania : quarterly report Author(s) Campbell, Kenneth L.
Proposal for a Sitatunga reserve on the Kagera River, West lake region, Tanzania Author(s) Borner, Markus
Meeting on the reintroduction of the bearded vulture, Gypaetus barbatus aureus (Hablizl 1788), into the Alps, Morges 17-18 November 1978 : report of proceedings
Gypaetus barbatus bulletin : Bartgeierprojekt WWF/IUCN = Project Bearded Vulture = Projet Gypaète barbu
