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pro vyhledávání: '"D Helpin"'
Autor:
J Dixon, Sir J Alleyne, G H Ogston, W Anderson, J B Alliott, J G C C Godsman, D Helpin, C W Siemens, W E Rich, J C Wilson, W Knaggs, E Beanes, Redman, H Letherby, Davy, G Phillips, E A Cowper
Publikováno v:
Minutes of the Proceedings of the Institution of Civil Engineers. 35:71-108