A Grammar of Obolo ìre ikpa usọ usem eyi tele Nikolas Faraclas ogebe me acha 198x isa ikpa iwele ike usem Obolo okupbe, igọọk me ubọk iwọlọ-usem ebi usọ usem. Ikpa yi ore adasi ikpa eyi ogwu usọ usem ogebe ibak usem Obolo.

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