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The Book of Priestcraft (Advanced Dungeons & Dragons: Birthright, Campaign Accessory/3126), by Ed Stark, Duane Maxwell, Dale Donovan
Player's Secrets of Ilien (AD&D: Birthright Domain Sourcebook), by Kevin Melka
Sword and Crown (Birthright, 3102), by McComb, Colin
Naval Battle Rules: The Seas of Cerilia (Birthright), by Baker, Rich