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41. Bromine in 1974.

42. Sodium compounds in 1975.

43. Tungsten in 1975.

44. Abrasive materials in 1975.

45. Asbestos in 1975.

46. Barite in 1975.

47. Boron in 1975.

48. Bromine in 1975.

49. Chromium in 1975.

50. Clays in 1975.