Market Conditions; The Validity of Employment Contracts; Development of South Australian Copper and Oil Resources; Glauber's Salt from the Caspian Sea; British Board of Trade; Potash Deposits in Spain; China Clay; Production of Zinc; Concrete Plugs in Mines; Tungsten Market in Great Britain; The Need for Petrol Substitutes; Hardened Filter Paper; Borneol from Waste Sulfite Liquor; The World's Coal Supply
1915 ◽
Vol 7
(11)
◽
pp. 997-999
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