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SCA

House Corvus
Society for Creative Anachronism
Kingdom of Atlantia

Steampunk

Contemporal
Upstate Steampunk Extravaganza
The Steampunk Empire -- The Crossroads of the Aether
The Steampunk Home at blogspot
Girl Genius

Railroads

Central Model Railway and Historical Society (US, SC)
National Railway Historical Society (US)
National Railway Museum (UK)
National Model Railroad Association