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581. Water; by William H. Kerns.

582. Zinc; by Harold J. Sehroeder.

584. phosphate rock; by Richard W. Lewis.

585. Vermiculite; by Timothy C.

587. Aluminum; by John W. Stamper.

588. Antimony; by Donald E. Moulds.

589. Asbestos; by Timothy C. May.

590. Barite; by John W. Cole.