RICHARDS, ROBERT H.
Textbook of ore dressing, by Robert H. Richards & Charles E. Locke. Assisted by Reinhardt Schuhmann. 3d ed.
RICHARDS, ROBERT H. Textbook of ore dressing, by Robert H. Richards & Charles E. Locke. Assisted by Reinhardt Schuhmann. 3d ed. © 16May40; A141441. Old Colony Trust Co. (E of Charles E. Locke); 30Nov67; R423307.
Old Colony Trust Co.|E of Charles E. Locke