Reddit reviews Racing for the Bomb: General Leslie R. Groves, the Manhattan Project's Indispensable Man
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Used Book in Good Condition
Both were experiments in a sense. The targeted cities received little of the strategic bombings that other Japanese cities received to see the full extent of the bombs of "pristine cities".
As to the bombs, I believe that the gun type bomb was thought to be simple and reliable that no test was necessary. With the small amount of fissible material available, they considered it wasteful to test that design.
As I recall the gun type weapon literally smashes the atoms together. It fires a projectile into the target at the other end of a 105mm howitzer barrel. If it didn't work, atomic weapons themselves wouldn't work.
It's been a long time since I read it but I think the book was called Racing for the Bomb. It is definitely worth a read.
Racing for the Bomb: General Leslie R. Groves, the Manhattan Project's Indispensable Man https://www.amazon.com/dp/1586420399/ref=cm_sw_r_cp_taa_kOS7ybKT21176