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Primary
ibiblio

Ibiblio: Statement on the Atomic Bomb by Secretary of War Stimson

For Students 9th - 10th
Statement made on August 6, 1945, by the former Secretary of War, Stimson. Discusses the details of the production of the atomic bombs used to end World War II. Introduces the members of the Interim Committee as well. Site by Ibiblio.org.
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Website
Other

Nuclearfiles.org: Truman and the Atom Bomb

For Students 9th - 10th
Read background information about Harry Truman and the development of the atomic bomb prior to his presidency. Includes excerpts from official documents and conversations during the Truman Administration.
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Website
US Department of State

U.s. Department of State: Stimson Doctrine

For Students 9th - 10th
This page from the U.S. Department of State provides a copy of the Stimson Doctrine. The information is only one paragraph in length, but factual and worth checking out on the subject.