en.wikipedia.org
en.wikipedia.org
collectspace.com
michaeljfox.org
The Michael J. Fox Foundation for Parkinson's Research
https://www.michaeljfox.org › bio › michael-r-rich-clifford
nasa.gov
nasa.gov
simple.wikipedia.org
spacecenter.org
Space Center Houston
https://spacecenter.org › remembering-nasa-astronaut-rich-clifford
ae.gatech.edu
supercluster.com
astronautix.com
Encyclopedia Astronautica
www.astronautix.com › c › clifford.html
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