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Clinker is the term for the material remaining after the process of smelting a metal ore. It may contain ash from the smelting fire, and also the impurities, rock, and unreduced metal oxides. Clinker is used in the manufacture of Portland cement.

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Thomas a Kempis

... purgatory (iv. 9), and the worship of saints (i. 13, ii. 9, iii. 6, 59). In other works, however, Thomas Kempis exalts Mary as the queen of heaven, th ...

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