TABLE OF CONTENTS: The beginnings of the med -- First steps -- The uranium ore supply -- The plutonium project -- Los Alamos : I -- Hanford : I -- Hanford : II -- Oak Ridge -- Negotiations with the British -- Security arrangements and press censorship -- Los Alamos : II -- The combined development trust -- Military intelligence : Alsos I — Italy -- A serious military problem -- Military intelligence: Alsos II — France -- The problem of the French scientists -- Military intelligence : Alsos III — Germany -- Training the air unit -- Choosing the target -- Tinian -- Alamogordo -- Operational plans -- Hiroshima -- The Germans hear the news -- Nagasaki -- The med and congress -- The destruction of the Japanese cyclotrons -- Transition period -- The AEC -- Postwar developments -- A final word -- Appendixes.