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|url = https://archive.org/details/AnEssayTowardsARealCharacterAndAPhilosophicalLanguage
|publisher = [[Royal Society]]
|location = [[Londen]]}}</ref><ref>{{cite book
|url = https://books.google.co.uk/books?id=ta2LBQAAQBAJ
|title = Thomas Jefferson and his Decimals 1775–1810: Neglected Years in the History of U.S. School Mathematics
|first1 = MA (Ken)
|last1 = Clements
|first2 = Nerida F
|last2 = Ellerton
|publisher = Springer
|date = 19 November 2014
|isbn = 978-3-319-02504-9
|location = Heidelberg, New York, Dordrecht, London
|page = 65}}</ref>
 
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