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41. Potash in 1975.

42. Pumice and volcanic cinder in 1975.

43. Rhenium in 1975.

44. Salt in 1975.

45. Sand and gravel in 1975.

46. Stone in 1975.

47. Sulfur in 1975.

49. Titanium in 1975.

50. Vermiculite in 1975.