Foundry 101 - Hobby metal casting. Learn to cast aluminum and brass in sand molds. Includes step by step instructions with pictures. - http://www.foundry101.com/
18th Century Trade Secrets Relative to Metals - Detailed instructions of the methods used by metal workers in the 18th century. - http://www.old-crafts.com/metals/secrets_relative_to_metals.htm
The Hawley Collection - An edge-tools and cutlery collection housed at the University of Sheffield, in the U.K, and a description of the project. - http://www.shef.ac.uk/hawley/
The Metalworking FAQ/Compendium - Based on the FAQ and other information for the UseNet newsgroup rec.crafts.metalworking. - http://w3.uwyo.edu/~metal/
Anvilfire - Blacksmiths' and metal workers' reference. Questions answered daily by the Guru. Meet and chat with other smiths at the Slack Tub Pub. Buy, sell, and trade at the Virtual Hammer-In. - http://www.anvilfire.com/