NPRNTitleType Of SiteRelationNPRN402080TitleIronstone Levels, East of Plymouth Ironworks, Merthyr TydfilType Of Siten/aRelationAssociated withNPRN34853TitlePlymouth Ironworks: Railway Tunnel;Trevithick's Tunnel, Merthyr Tramroad, Merthyr TydfilType Of Siten/aRelationAssociated with
