The First Men In The Moon is an early science fiction story telling of the adventures of two men who travel to the moon and find it inhabited. It tells of their adventures there and how one of the men escapes and travels back to earth. The second book The World Set Free tells of a future war using radioactive bombs which accelerate the process of radioactive decay. And causes a bomb to continue to emit radioactive damage, continuing to explode for days on end causing every increasing damage.
Used availability for H G Wells's The First Men in the Moon and The World Set Free