The platinum metals

by Arthur Douglas Lumb

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[34]. Board of Trade Journ., 1917, 99, p. 156.

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[38]. Board of Trade Journ., April 17, 1919, p. 504.

[39]. Howley, G. P.: Mining World, 1907, 26, p. 783.

[40]. N.S.W. Dept. of Mines, Ann. Rept. for 1918, p. 52.

[41]. N.S.W. Dept. of Mines, Ann. Rept. for 1915, p. 59.

[42]. Hill, Jas. M.: “Platinum and Allied Metals in 1916,” U.S. Geol. Surv., July 12, 1917.