AscentStudios
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If you can't get a hold of the Psychic's Handbook, there's also the old Shadowforce Archer supplements for Spycraft first edition - the core book had another skills n feats psionics ruleset, which you could use outside of the classes included in the system. The supplements added weirder psychic powers if you want to go beyond the basics, too. Definately different from the DnD style psionic powers if you're looking to go that route.