William Henry Flower and Richard Lydekker, 1911 Encyclopædia Britannica, Volume 28… (1911)
“ The latter species (Equus zebra) inhabits the mountainous regions of the Cape Colony, where, owing to the advances of civilized man into its restricted range it has become very scarce, and is even threatened with extermination, but it exists in the form of a local race in Angola. ”
