Reference 1: Iron ore, Pig iron, Direct iron and Steel.
Reference 2: China, Australia, Brazil, Japan, India, Russia, Ukraine, South Korea, Germany and World.
Source: http://en.wikipedia.org/wiki/Iron#Biological_role
Reference 2: China, Australia, Brazil, Japan, India, Russia, Ukraine, South Korea, Germany and World.
Source: http://en.wikipedia.org/wiki/Iron#Biological_role