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542. Lead; by Donald E. Moulds.

543. Lead; by Donald E. Moulds.

544. Lime; by Paul L. Allsman.

545. Lithium; by Donald E. Eilertsen.

547. Magnesium; by Lloyd R. Williams.

548. Manganese; by Gilbert L. DeHuff.

549. Mercury; by George T. Engel.

550. Mica; by Benjamin Petkof.