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51. Mica in 1923; by B. H. Stoddard.

56. Gypsum in 1923; by K. W. Cottrell.

57. Peat in 1923; by K. W. Cottrell.

58. Fuel briquets in 1923; by W. F. McKenney.

59. Tin in 1923; by Bertrand Leroy Johnson.