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Boyd, James I.C. (1985). Narrow Gauge Railways in North Caernarvonshire (Vol2) The Penrhyn Quarry Railway. Oxford: The Oakwood Press. ISBN 0-85361-312-5. OCLC 14641020.
Boyd, James I.C. (1985). Narrow Gauge Railways in North Caernarvonshire (Vol2) The Penrhyn Quarry Railway. Oxford: The Oakwood Press. ISBN 0-85361-312-5. OCLC 14641020.