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511. Barite; by Donald E. Eilertsen.

512. Bauxite; by Lloyd R. Williams.

513. Beryllium; by Donald E. Eilertsen.

514. Bismuth; by Donald E. Moulds.

515. Boron; by William C. Miller.

516. Bromine; by William C. Miller.

517. Cadmium; by Harold J. Schroeder.

520. Chromium; by John L. Morning.