One or more of the preceding sentences incorporates text from a publication now in the public domain: Greenhill, Alfred George (1911). "Hydromechanics". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 14 (11th ed.). Cambridge University Press. pp. 115–116.
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Vernon-Harcourt, Leveson Francis (2 July 2015). Rivers and canals, Volume 1, Rivers : with statistics of the traffic on inland waterways. Cambridge. ISBN978-1108080590. OCLC967596679.{{cite book}}: CS1 maint: location missing publisher (link)