W. Holman Bentley's Dictionary and Grammar of the Kongo Language was published in 1887. In the preface, Bentley gave credit to Nlemvo, an African, for his assistance, and described "the methods he used to compile the dictionary, which included sorting and correcting 25,000 slips of paper containing words and their definitions."[9] Eventually W. Holman Bentley with the special assistance of João Lemvo produced a complete Christian Bible in 1905.