These are letters that I have found that have been written by either Einstein himself or someone close to him.
This letter was the first in a series of four written by Albert Einstein to President Franklin Delano Roosevelt. It warned him about the possible dangers of Uranium--like the A-bomb.
This letter was the second letter to FDR written by Einstein.
There are two more letters that Einstein wrote to FDR; the third I cannot find a complete copy, and the forth I will add soon.
This letter was written by Einstein's father, Hermann Einstein, to a college professor.