Vitanage, P.W.2020-08-282020-08-281985Engineer, 13(3):p.4-28https://dl-iesl.nsf.gov.lk/handle/1/2348Engineering and TechnologyTunnellingGeological investigationsEnvironmental factorsCastlereagh tunnelVictoria tunnelPolgolla tunnelSite investigations and geological aspects of tunnellingArticle