1961
Photo of Yuri Gagarin courtesy of StarChild
http://starchild.gsfc.nasa.gov

1963
* Photo of electron microscope courtesy of MicroWorld
http://www.mwrn.com

1972
Photo of the Sears Tower courtesy of Skidmore,
Owings & Merrill LLP.
http://www.som.com

*Images pending approval.

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