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4672. Aluminum; by John W. Stamper.

4673. Antimony; by D. E. Moulds.

4674. Arsenic; by Arnold M. Lansche.

4675. Asbestos; by Timothy C. May.

4676. Barite; by Harold J. Drake.

4678. Beryllium; by Donald E. Eilertsen.

4679. Bismuth; by Donald E. Moulds.

4680. Boron; by William C. Miller.