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method of mining gypum

USG Corporation - Wikipedia, the free encyclopedia

History . In the 1890s gypsum manufacturers perfected a method of strengthening plaster by adding a retarder, which controlled the setting time, thus creating a ...

Gypsum - Wikipedia, the free encyclopedia

1 Etymology and history; 2 Physical properties; 3 Crystal varieties; 4 Occurrence; 5 Mining; 6 Synthesis; 7 Uses of gypsum; 8 Gallery; 9 See also; 10 External links ...

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