Manganese Metal Company
Manganese Metal Company (MMC) is the single largest producer of pure electrolytic manganese metal in the world. The company has a production plant located in Nelspruit in the Mpumalanga province of South Africa. MMC produces electrolytic manganese - the purest form of manganese - from ore mined in South Africa via a hydrometallurgical extraction process. From the metal a range of products are manufactured and marketed, the majority being exported to customers around the world. All the products are manufactured using a selenium free process - thus minimum 99.9% Mn content.
http://www.mmc.co.za/

Twin City Wire
USA Manufacturer of Woven Wire Cloth, Related Products and Manganese Wear Parts
http://www.tcwire.com/

Crusher Manganese Steels Ltd
Crusher manganese steels inc CEPCOR ltd. Suppliers of quality manganese wear parts, crushing plant crusher spares and crusher repairs. Crusher manganese steels for the complete crusher solution.
http://www.crushers.co.uk

Cerro Manganese Bronze Limited
Produce aluminum bronze, manganese bronze and nickel silvers to international specifications.
http://www.cerromb.com/

Stone Manganese Marine Ltd
Stone Manganese Marine Ltd, propeller design, propeller manufacture, specialists, UK
http://www.stonemanganese.co.uk

LANL: Manganese
Sources, properties, uses, and handling.
http://periodic.lanl.gov/elements/25.html

It's Elemental: Manganese
The Element Manganese - Basic Physical and Historical Information
http://education.jlab.org/itselemental/ele025.html

ChemicalElements.com: Manganese
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/mn.html

Wikipedia: Manganese
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Manganese

ChemGlobe: Manganese
The chemical element [Mn] - Manganese - Datasheet
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/25.html