Richard
Aha! I'm using Liber θ: Tarot Symbolism & Divination. It's a bit more extensive but seems to include less pomposity.
ETA: which, by the way, is interesting, in that this may indicate that The Hermetic Tarot gets its titles from Book T, whereas Thoth and Rosetta may be from Book θ.
In Book T, the T is for Tarot (Golden Dawn version).
In Liber Θ, the Θ is probably for ΘΩΘ [Thoth] (with possibly a deliberately ambiguous reference to ΘΕΛΗΜΑ [Thelema]).
One way to tell which is which is to note whether The Star is associated with Tzaddi (Golden Dawn) or Heh (Thelema).
The Hermetic is definitely Golden Dawn; the Rosetta is the Thelemic variant.
ETA. For me there is an uneasy aspect to Thelema as it pertains to the individual. I dare not go there just yet. Some day I may be ushered therein, whether I will or no. For now, I am terrified by the idea of the ultimate sacrifice of the ego ("self-will") to the demands of the Higher Self, HGA, God, or whatever. Call me chickenshit. I am not ready for the Abyss. I have acrophobia.