Good Link. It answers the questions in great detail.
Were atomic strikes necessary primarily to avert an invasion of Japan in November 1945?
Did Truman authorize the use of atomic bombs for diplomatic-political reasons-- to intimidate the Soviets--or was his major goal to force Japan to surrender and bring the war to an early end?
If ending the war quickly was the most important motivation of Truman and his advisers
to what extent did they see an "atomic diplomacy" capability as a "bonus"?
To what extent did subsequent justification for the atomic bomb exaggerate or misuse wartime estimates for U.S. casualties stemming from an invasion of Japan?
Were there alternatives to the use of the weapons? If there were, what were they and how plausible are they in retrospect? Why were alternatives not pursued?
How did the U.S. government plan to use the bombs? What concepts did war planners use to select targets? To what extent were senior officials interested in looking at alternatives to urban targets? How familiar was President Truman with the concepts that led target planners to choose major cities as targets?
Did President Truman make a decision, in a robust sense, to use the bomb or did he inherit a decision that had already been made?
Were the Japanese ready to surrender before the bombs were dropped? To what extent had Emperor Hirohito prolonged the war unnecessarily by not seizing opportunities for surrender?
If the United States had been more flexible about the demand for "unconditional surrender" by guaranteeing a constitutional monarchy would Japan have surrendered earlier than it did?
How greatly did the atomic bombings affect the Japanese decision to surrender?
Was the bombing of Nagasaki unnecessary? To the extent that the atomic bombing was critically important to the Japanese decision to surrender would it have been enough to destroy one city?
Would the Soviet declaration of war have been enough to compel Tokyo to admit defeat?
Was the dropping of the atomic bombs morally justifiable?
The Atomic Bomb and the End of World War II: A Collection of Primary Sources
Thanks for the correction.