Medical philately. Missionary medicine.
D002050:Burkina Faso; D005681:Gabon; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D066189:Missionaries; D010678:Philately; D008921:Religious Missions / Q000266:history*; D014900:West Indies