LevelSub-groupDescriptionSurvey of the New Pandora Lead Mine carried out by David Percival, 1990.ArchiveNMR Site FilesDateArchive Number6432888
LevelSub-groupDescriptionSurvey of Pent-pont-pren carried out by Geoff Ward, April 1990ArchiveNMR Site FilesDateArchive Number6438548
LevelSub-groupDescriptionSurvey of Plas Newydd, comprising report, site plan and photos produced by RCAHMW 2001.ArchiveNMR Site FilesDateArchive Number6442282