Published by Judges Guild.
Although Supplement II to OD&D was entitled Blackmoor, the book described very little of the setting of Dave Arneson’s fantasy campaign. That task was taken up by The First Fantasy Campaign, published by Judges Guild in 1977. Part gazetteer of Blackmoor and its famed dungeon and part rules supplement, FFC is a remarkable peek into another take on D&D, one very different than the Gygaxian paradigm that most of us, consciously or unconsciously, take to be its native idiom. For those of us in the old school movement, this is an invaluable document, not just for the information it provides about the earliest campaign setting in the history of the hobby, but also for the way it presents another way to play OD&D, making Arneson the patron saint of rules modders and home brewers.
Read the Full Retrospective/Review at Grognardia.