Instruct: Classify a given review as either positive or negative.
Query: Dubious work

A thought-provoking but finally frustrating book whose theses are not backed by the facts. Read with caution. It's worth reading Peter T. Daniel's review of the book on the H-Africa list [H-Net Reviews] as Daniels has a lot of useful things to say on the book which may not be apparent to the non-specialist in Afro-Asiatic languages.