An Englishwoman's twenty-five years in tropical Africa: being the biography of Gwen Elen Lewis, missionary to the Cameroons and the Congo, by George Hawker

http://www.archive.org/details/anenglishwomanst00hawkuoft

Bolenge : a story of gospel triumphs on the Congo by Eva May Dye

http://www.archive.org/details/bolengeastoryofg00dyeeuoft

Pioneering in the Congo. by John McKendree Springer ...

http://www.archive.org/details/pioneeringincong00spririch