660 - Chemical engineering 756
664 - Food technology 112
669 - Metallurgy 62
666 - Ceramic & allied technologies 28
665 - Industrial oils, fats, waxes & gases 27
663 - Beverage technology 24
662 - Explosives, fuels & related products 16
668 - Technology of other organic products 15
667 - Cleaning, color & coating technologies 10
661 - Industrial chemicals 8
330 - Economics 1
610 - Medicine & health 1
640 - Home & family management 1