Columbia subject headings:
Christianity and other religions--Islam.
Islam--Africa.
Islam--Relations--Christianity.
Missions--Africa--History--20th century.
Harvard subject headings:
Christianity and other religions--Islam
Islam--Africa
Islam--Relations--Christianity
Missions--Africa--History--20th century.
Princeton subject headings:
Christianity and other religions--Islam.
Islam--Africa.
Islam--Relations--Christianity.
Missions--Africa--History--20th century.