National Geographic, February, 1943, "Alaskan Highway, an Engineering Epic".  Describes the role of Black engineers and how the project eventually became integrated.  Initially, there were Black and White engineer battalions, but the Blacks accomplished so much more than their White counterparts that the decision was made to integrate the effort.  Everyone thinks that the Tuskegee Airman was the impetus to desegregate the military, but the construction of the Alaska Highway was the real event.