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291. Ferroalloys; [by Horace T. Reno].

293. Gem stones; [by Jerry J. Gray].

294. Gold; [by Charles D. Hoyt].

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

296. Gypsum; [by Roy Y. Ashizawa].

297. Helium; [by Edwin M. Thomasson].

300. Iron and steel; [by F. E. Brantley].