Sources:
http://www.space.com/11772-president-...
https://www.nasa.gov/mission_pages/ap...
https://www.cbo.gov/publication/18196
http://history.nasa.gov/SP-4206/p405.htm
http://history.nasa.gov/SP-4029/Apoll...
http://www.wolframalpha.com/input/?i=...)
http://www.wired.com/2011/04/0412sovi...
http://www.space.com/18422-apollo-sat...
https://airandspace.si.edu/explore-an...
http://www.hq.nasa.gov/alsj/a11/a11.l...
http://www.parkes.atnf.csiro.au/news_...
http://www.hq.nasa.gov/alsj/a11/a11.p...
http://history.nasa.gov/SP-4029/Apoll...
https://www.theguardian.com/science/2...
http://history.nasa.gov/SP-4029/Apoll...
http://history.nasa.gov/conghand/prop...
http://er.jsc.nasa.gov/seh/ricetalk.htm
http://www.lpi.usra.edu/lunar/mission...
http://www.nasa.gov/mission_pages/LRO...
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