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Dear Mr. Wynn,
Thank you for posting your question on History Hub!
We searched the National Archives Catalog for any records relevant to your query. The search produced the following results.
Also, we would suggest into looking at a collection of digitized records titled “The Decision to Drop the Atomic Bomb” at the Harry S. Truman Library as they may contain information of interest to you.
In addition, it might be useful to review some other online resources including “The Manhattan Project” at the U.S. Department of Energy website and “The Atomic Bomb and the End of World War II” at the National Security Archive website.
Further, there is a U.S. Army Center of Military History publication titled “Manhattan: The Army and the Atomic Bomb” by Vincent C. Jones that provides a lot of information on this topic.
We hope this is helpful. Best of luck with your research!