I visited Los Alamos earlier this year and talked to a retired materials scientist at the visitor center. He said that we have lots of books about the science and scientists that worked on the bomb during WWII, but very little mention of the engineering or engineers - and that's largely because it's extremely classified. The scientists can talk about most of their work because it's too broad to give any real aid to the enemy, but the engineers can't because they could REALLY speed up someone else's weapons program.