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Home > Quarry and mining > method of mining gypum
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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