(8vo) salmon cloth, dust jacket. First Edition.

First trade edition (preceded only by a mimeographed version prepared for the press).  Signed on the front free endpaper and on the half title by 25 of those involved in the production and destruction of the first atomic bomb. Signers include:

• Robert Oppenheimer. Manhattan Project Director
• Ralph Carlisle Smith. Manhattan Project lawyer, present at Trinity Test
• W.S. Parsons. Manhattan Project Ordnance expert and Chief Weaponeer on the Enola Gay
• William Stewart. Engineer, witness to Trinity Test
• George Kistiakowsky. Head of National Defense Research Committee, X Division
• Kenneth Bainbridge. Director Project Trinity
• Norris Bradbury, Director Los Alamos
• A.D. Van Vessem. Scientist
• Phil Dailey. Scientist
• W.F. Schaffer. High Explosives Expert
• Roger S. Warren. Fat Man bomb assembly team leader
• Frances Dunne. Explosives technician (and one of few women involved in the Manhattan project)
• Jerry Ackerman. Major Special Engineering Detachment, in charge of 'S' site at Los Alamos
• D.P. Mitchell. Head of Technical Procurement and later Assistant Director of Los Alamos.
• David Dow. Assistant to Robert Oppenheimer, in charge of non-technical activities at Los Alamos and the Compagna Hill monitoring site, 20 miles from the Trinity test.
• Harry S. Allen. Head of Procurement for the Manhattan Project
• Bruno Rossi. Experimental physicist at Trinity test.
• Harvey S. North
• Cyrus W. Ingraham
• Henry Koshofer
• M.J. Weisenborne
• Robert J. Michalski
• C.P. Barncaid(?)
• C.S. Poferiska(?)
• Howard C. Phanstiel(?)

We have been able to confirm that at the first 19 of these individuals (and likely the other 6 as well) were part of the 'Project Y' team at Los Alamos. Mounted inside the front cover is a 3x3" printed label with the symbol of the Los Alamos Laboratory, designed by George Beyers, head of security at Los Alamos. This is the symbol for "Project Y", code name for the laboratory that designed and fabricated the first atomic bomb. We can locate only one other mention of this symbol on any related artifact or document.