Note 183 — Chapter XXXI · PLATINUM By James. M. Hill

Duparc, Louis: “Le Platine et les gîtes platiniferes de l’Oural”: Soc. des Eng. Civ. de France. Bull. Jan.-Mar., 1916.

[184] Kemp, J. F.: “The Geological Relation and Distribution of Platinum and Associated Metals”: U. S. Geol. Survey Bull. 193.

[185] Analyses cited by Kemp.

[186] Io₃ is abbreviation used for osmiridium.

[187] Analyses cited by Duparc.