The Smyth Report
As progress on the development of the atomic bomb proceeded, it became clear that the use of the bomb would have far-reaching consequences. Among other things, people would want to know all about the bomb, it's development, and so on. On the one hand was a concern to distribute as much information as possible; on the other, a need to retain as secret whatever could be kept secret. It was decided that these disparate goals could be met by releasing an "official" version.
In March 1944 Henry DeWolf Smyth of Princeton was given the task of writing the report, officially titled Atomic Energy for Military Purposes, but generally known as the Smyth Report. It was prepared and ready for distribution in August 1945, immediately after dropping the atomic bombs.
A short account of the publication of the report.
An interesting story regarding how to reproduce and prepare for distribution the most sensitive report ever written. (How do you like the cartoon?)