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362. Diatomite; [by J. M. West].

364. Ferroalloys; [by John W. Thatcher].

366. Gem stones; [by Benjamin Petkof.]

367. Gold; [by J. Patrick Ryan].

368. Graphite; [by Lewis K. Weaver].

369. Gypsum; [by Paul L. Allsman.]

370. Helium; [by Billy J. Moore.]