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Amgueddfa Cymru – Museum Wales
Navy hardback book with maroon spine. North's Navigation Collieries (1889) Limited monthly records of ventilation. Dated January 1890 to December 1897. Collieries concerned : Coegnant No. 9, Park Slip, Wyndham, Maesteg Deep and Caerau.
Detailed desrciption of book in related material.
