In every old school or OSR campaign there's always been a Blackmoor campaign region. Don't ask me why but it has always come down in Greyhawk that Blackmoor existed there regardless of the history between Dave Arneson & Gary Gygax. So I began the task of combing through the back alleys of The Black Moor Archive & came up with the article titled Blackmoor & Greyhawk.
For most people some of this information & links is ancient history. A curious wrinkle in the fabric of old school & OSR gaming. For me as a dungeon master its a look behind the curtain of another perspective of the Greyhawk setting. An interesting corner of the this expansive campaign & we used Greyhawk & still do.