The Atomic Bomb - The Manhattan Project: Making

The project was spread across clandestine "secret cities" in the United States. The Manhattan Project - Department of Energy

The project was a monumental collaboration between military organization and scientific research. The Manhattan Project: Making the Atomic Bomb

While not a project member, his 1939 letter to President Roosevelt warning of German nuclear potential served as the project’s initial catalyst. 2. Major Research and Production Sites The project was spread across clandestine "secret cities"