http://www.optcorp.com/edu/articleDetailEDU.aspx?aid=1005
http://www.nottingham.ac.uk/manuscriptsandspecialcollections/learning/biographies/williamparsons,3rdearlofrosse(1800-1867).aspx
http://www.britannica.com/EBchecked/topic/510159/William-Parsons-3rd-earl-of-Rosse
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