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501. Ferroalloys; by John W. Thatcher.

502. Iron ore; by F. E. Brantley.

505. Salt; by William H. Kerns.

506. Asbestos; by Timothy C.

507. Vermiculite; by Timothy C.

509. Aluminum; by John W. Stamper.

510. Antimony; by Donald E. Moulds.