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Hackmaster: Official Player's Handbook, by Team, The Hackmaster Development
HackMaster: The Spellslinger's Guide to Wurld Domination, by Morgan,Kolman,Kenzer,Johansson,Jelke,Jolly R. Blackburn
Hackmaster: The Hacklopedia of Beasts, Vol 8, by Team, The Hackmaster Development
Lost Caverns (Hackmaster Adventure S4), by Thompson, Phil
HackMaster Basic RPG, by Steve Johansson,Mark Plemmons,David Kenzer,Jolly R. Blackburn