Florida-Spectrum Environmental Services
Florida Spectrum: Chemical Fact Sheet: Iron
A very good summary of basic information about iron, including its uses, physical and chemical properties, and role in the earth.
Other
Hognosesam: Materials Metal, Wood and Plastic
This site describes building materials, their strengths and weaknesses, and how to choose the correct material for a project.
Other
Hognosesam: Production of Ferrous Metal
This site describes how pig iron is produced and then refined into cast iron or steel.