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81. Antimony in 1975.

82. Gold and silver in 1975.

83. Lead in 1975.

85. Platium-group metals in 1975.

86. Selenium and tellurium in 1975.

87. Zinc in 1975.

88. Aluminum and bauxite in 1975.

89. Beryllium in 1975.

90. Cadmium in 1975.