Building Materials
Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, coal and lime stone
Iron ore, carbon and lime stone
Iron ore, coal and sulphur
Iron ore, carbon and sulphur

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Building Materials
Putty is

All listed here
Softened by a solution of pearl ash and quick-lime soaked in water
Used for fixing glass panes
Made with finely powdered chalk and linseed oil

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