Polton Patent brick found in Russia
— 13/10/2020This brick was found by Anastasiya Proshicheva at the site of an abandoned village at Svir River near
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Polton Colliery and Brickworks, Polton, Midlothian
— 15/06/2017Polton Coal Company Limited – Brick and Fire Clay Manufacturer, Bonnyrigg, Lasswade, Edinburgh.
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Whitehill Collieries and Brickworks, Rosewell, Midlothian
— 15/05/2017Whitehill Fireclay Works, Rosewell, Midlothian. Scottish Mining Canmore 01/02/1861 – Glasgow Herald
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Polton Patent
— 02/06/2016Found in Jedburgh. Polton Coal Company Limited – Brick and Fire Clay Manufacturer, Bonnyrigg, Lasswade,
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