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SJR2 Spelljammer Realmspace w/Map, by Dale Slade Henson
Legend of Spelljammer (AD&D 2nd Ed Fantasy Roleplaying), by Jeff Grubb
Practical Planetology (AD&D/Spelljammer Module SJR4), by Findley, Nigel D.
The Complete Spacefarer's Handbook (Spelljammer Campaign Reference, Advanced Dungeons & Dragons, 2nd Edition), by