Series is exactly comparable to pre-1960 data. Alumina, bauxite, cryolite. Series is exactly comparable to pre-1960 data. Aluminium pigs, ingots, blocks and scrap. Series is exactly comparable to pre-1960 data.
Data are no longer available.
Data from 1960 on are more comprehensive than on the old basis. Series is exactly comparable to pre-1960 data. Data from 1960 to 1975 are less comprehensive than the pre-1960 data. Mangenese in ores. Series is exactly comparable to pre-1960 data.