Adeiladu muriau cerrig sych ar Reilffordd Ffestiniog = Dry stone walling on the Ffestiniog Railway /
Jarvis, Peter.
Rheilffordd Ffestiniog Railway.
Porthmadog : Rheilffordd Ffestiniog Railway,
1994
Original ed: Blaenau Ffestiniog: Rheilffordd Ffestiniog Railway, 1993.
Stone walls