North East Wales Geological trail leaflets
NEWRIGS [North East Wales RIGS group], a partner to Gwynedd and Môn RIGS who were the founders of GeoMôn, produced a series of geological trails around towns in Clwyd, including a guide to the Llangollen steam railway. They can all be downloaded here for free.
Trails for Conwy & Gwynedd
…and Cheshire [these were related to the Clwyd group]