JW411 is right Zazoo, its the best book on the subject I've ever read. Followed the news releases in the 60's while still in school. Remember being completly fasinated by the effort and the "steel nerves" of the flight crews basically flying "against all odds".
The crews were mercenaries for the most part but reflected the fact that mercenary actions have positive results on occassion.
I own a copy of "Shadows" and consider it a collectors item as its very well done and outlines all aspects of the airlift, with pictures etc. One or two Connies still parked in Sao melting into the ground.
One very depressing note was that there was a cemetary at Ulli maintained by the missionaries for all the people who were killed in crashes at Ulli. After the war ended the Nigerian Government bulldozed the cemetary out of exitence.
Get a copy if you can as its really worth having and reading.