A very significant review of TSOTGD is Ellic Howe's THE MAGICIANS OF THE GOLDEN DAWN. I found it very helpful, very well documented. Nothing on Beloit, nothing on Williams who was only a minor member. Lots about the tarot. P.
For a virtually contemporary take, one could look at Chas. Williams' THE GREATER TRUMPS. Williams, like Yeats, Crowley, &c. belonged to the Society of the Golden Dawn which carried a lot of cultural weight at a time when the occult was very influential.
"[T]he Tarot fortune is more than incidental to the meaning and movement of The Waste Land. ... "[I]ndividual reflection" provides meaning for the cards, since "the pictures are like doors which open into unexpected chambers or like a turn in the open road with a wide prospect beyond."