Gypsum Processing
Gypsum is used as a building material, making writing chalk, as a soil conditioner and to make moulds for pottery.
1997 , Otto Ruskulis
PDF ,Practical Action , English
Gypsum is used as a building material, making writing chalk, as a soil conditioner and to make moulds for pottery.
1997 , Otto Ruskulis
PDF ,Practical Action , English
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