also British industrial narrow gauge railways British narrow gauge slate railways Mine exploration References Further reading External links Bal Maidens & Mining Women British Isles History of the Welsh slate industry Slatesite — bilingual site focusing on Welsh slate Aerial photographs of slate quarries in Wales John T F Turner – A Familiar Description of the Old Delabole Slate Quarries, 1865 http://www.darkplaces.co.uk http://www.aditnow.co.uk http://www.mine-explorer.co.uk/ http://www.mineexplorer.org.uk/ Outside the British Isles Fell Exhibition Slate Mine — near Trier (Mosel), Germany Granville Slate Museum Buckingham Slate Galician and Spanish Slate