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431. Sulfur in 1974.

433. Vernuculite in 1974.

434. Zirconium and hafnium in 1974.

435. Aluminum and bauxite in 1974.

436. Columbium and tantalum in 1974.

437. Copper in 1974.

438. Fluorspar in 1974.

439. Iron and steel in 1974.

440. Tin in 1974.