Fredsflygarna FN-flyget i Kongo 1960-1964 - Lief Hellstrom
This is an excellent, large format, very well illustrated, 360 page book in Swedish on the role of Sweden and the aircraft with the UN Operation in the Congo 1960-1964, including the DC3-C47
D'Lynn Waldron's DC 3 Web Page
For an excellent history of the Congo, plus the aircraft see http://worldatwar.net/chandelle/v2/v2n3/congo.html