Archif6550129TeitlDBHSC_035_02 - D.B. Hague Slide CollectionLefelItemDisgrifiadColour slide showing Nantle Slate Mine "support for blondin", taken by Douglas Hague, May 1967.CyfrwngPhoto.Delweddaun
Archif6438783TeitlDMHC04_155 - Dr Michael Harrison CollectionLefelSub-groupDisgrifiadColour slides showing sites and buildings in Dr Harrison's classification "Slate - 10470".Cyfrwng20 slides. Photo.Delweddaun
Archif6438784TeitlDMHC04_156 - Dr Michael Harrison CollectionLefelSub-groupDisgrifiadColour slides showing sites and buildings in Dr Harrison's classification "Slate - 10470".Cyfrwng20 slides. Photo.Delweddaun
