Author: THE HORDEN COLLIERIES LTD.
Title: Grading coal scientifically.
Description: [Darlington: printed by Dressers for the company,] 1930. 14 x 21cm. 34pp including 11 plates and a frontispiece within the pagination; printed on 'art' paper. Original printed pictorial embossed-card wraps, cord tie. Small area of brown residue to rear wrap. No copy located.

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