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21. Bromine in 1975.

22. Chromium in 1975.

23. Clays in 1975.

24. Cobalt in 1975.

25. Columbium and tantalum in 1975.

26. Diatomite in 1975.

27. Feldspar and related minerals in 1975.

28. Ferroalloys in 1975.

29. Fluorspar in 1975.

30. Gem stones in 1975.