The United States Sign Council Online         (http://www.ussc.org)

International Neon Association      (http://www.neonshop.com)

National Fire Protection Agency (http://www.nfpa.org)

The National Association of Sign Supply Distributors    (http://www.nassd.org/)

International Sign Association     (http://www.signs.org)

Sign Shops

Steel Art       (http://www.steelart.com)

Neon Products       (http://www.neonproducts.com)

Zip Signs       (http://www.zipsigns.com)

Other

Signs of the Times      (http://www.signweb.com)

Underwriters Laboratories     (http://www.ul.com)