Tello, José L. P. Lobão.; Van Gelder, Richard George, 1928-
(New York : American Museum of Natural History, 1975)
"We made observations of nyala (Tragelaphus angasi) for more than 2000 man-hours primarily between September, 1971, and April, 1974, in Zinave National park, Mozambique, and vicinity, mostly in a study area of approximately ...