The platinum metals

by Arthur Douglas Lumb

[13]. Chem. and Met. Eng., Oct. 15, 1918, p. 607.

[14]. Hill, Jas. M.: “Platinum Deposits of the World,” Eng. Min. Journ., June 30, 1917.

[15]. Merz, A. R.: Journ. Ind. and Eng. Chem., Nov. 1918, 10, No. 11.

[16]. Annual Statements of Trade of the United Kingdom.

[17]. Spurr, J. E.: “Who Owns the Earth?” Eng. Min. Journ., Feb. 7, 1920.

[18]. Records Geol. Surv. of India, 1916, 47, pt. 3, p. 163.

[19]. Records Geol. Surv. of India, 1919, 50, pt. 3, p. 156.

[20]. Records Geol. Surv. of India, 1915, 46, p. 284.

[21]. Zealley, A. E. V.: South Rhod. Geol. Surv., Short Rept. No. 3, March 20, 1918.

[22]. Bull. Imp. Inst., 1907, 5, p. 137.