Ibexes in an african environment : Ecology and Social system of the walia ibex in the simen mountains, ethiopia - B. Nievergelt (Berlin Springer Verleag, 1981)
B. Nievergelt: Ibexes in an african environment : Ecology and Social system of the walia ibex in the simen mountains, ethiopia. Berlin. Springer Verleag, 1981. 3-540-10592-1--(599.7358NIE)
ENGLISH