Explore these examples of primary sources materials... Hubble Space Telescope Images View all of Hubble's images since 1990! Historical Documents on the Atomic Bomb Read Albert Einstein's "atomic" letters to President Roosevelt as well as accounts by Japanese survivors. Eyewitness Account of the 1906 Earthquake Read first-hand accounts of the 1906 San Francisco earthquake that destroyed most of the city. Galileo's Sunspot Sketches See Galileo's actual sketches used to determine the rotational rate of the sun and which were used by the Church to indict him.
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