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2513. Aluminum; [by John G. Parker].

2514. Antimony, [by L. E. Davis].

2515. Asbestos; [by Paul W. Icke.]

2516. Barite; [by W. Gene Diamond.]

2517. Bauxite; [by John G. Parker].

2518. Beryllium; [by Henry C. Meeves].

2519. Bismuth; [by Harold J. Schroeder.]

2520. Boron; [by J. M. West].