The first Bube-to-English primer was authored in 1875 by William Barleycorn, a colonial era Primitive Methodist missionary of Igbo and Fernandino descent, while he was serving in the Bubi village of Basupu.
Janssens (1992–93) posits that they are all of Guthrie's zone A.60 languages, half of his A.40 languages, and perhaps Bube (A.31).
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