Note 161 — Chapter III
Reading edition
N. W. Thomas classifies Yoruba, Edo, Ibo and Efik as four main stocks in the Western Sudanic language group. "In the Edo and Ibo stocks people only a few miles apart may not be able to communicate owing to diversity of language" (p. 141). Anthropological Report of the Ibo-speaking Peoples of Nigeria, Part 1. 1913.