I'm my series of HRef Threads, I'm now making a list of resources for North America to be used as a D&D setting. I will include all eras including Viking Age Adventures, Native Americans, and Old West resources.
- HR1 Vikings
- Greenland Saga: The Lost Norse Colony (Avalanche Press)
- D20 Past
- Atruaghin (Mystara)
- Northern Star
- Boot Hill (TSR)
- Aces & Eights (KenzerCo)
- Deadlands (Pinnacle)
- Werewolf the Wild West (White Wolf)
- Six Guns and Sorcery - Supplement for Castle Falkenstein
- RuneQuest Vikings
- GURPS Vikings
Anything else you would add to a D&D campaign set in historical North America?