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Written by Philip Emmons Isaac Bonewits, Authentic Thaumaturgy is a magic system for role-playing games, based on the magic system Bonewits uses in real life in his capacity as the Archdruid of ADF (Ár nDraíocht Féin - “Our Own Druidism” in Irish Gaelic). The first edition was published by Chaosium in 1978, and a substantially expanded edition was published by Steve Jackson Games in 1998.
http://en.wikipedia.org/wiki/Authentic_Thaumaturgy
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