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Schofield, Roy; Joe Martin (1977). The story of Merddin Emrys and the Festiniog Railway. Cheam, Surrey, England: Cheam, 39 Northey Ave - Travel About Books. ISBN 9780905810003. OCLC 59993909.
Schofield, Roy; Joe Martin (1977). The story of Merddin Emrys and the Festiniog Railway. Cheam, Surrey, England: Cheam, 39 Northey Ave - Travel About Books. ISBN 9780905810003. OCLC 59993909.