I ordered a used copy of this book out of curiousity, and just received it.
Interestingly, the book was originally written in 1941, and published under the title "The Pursuit of Destiny." It doesn't say that it's been revised, but it's apparent from things written in the book that it has indeed been revised since 1941.
I was actually quite disappointed. Hasbrouck writes well, but the whole book is based on simply taking the Golden Dawn's astrology/tarot correlations and using them to just look up people's birthdays and arrive at a personality description based on what ten-day cycle, or decan, they were born in.
So, for each sign she has the GD-assigned major card (except for Scorpio, which she changes from Death to the Hanged Man, I presume simply to avoid the scary Death card), and then each ten-day section within that sign is illustrated with the GD-assigned pip card. So, for instance, within Libra (Justice), you have the first decan belonging to 2 of Swords, the second to 3 of Swords, and the third to 4 of Swords, just like in the GD system. So Justice describes your overall personality while the pip card goes into more detail.
Thus, only the majors to which the GD assigned signs are included in the system. The majors which the GD assigned to planets and elements are missing entirely.
She illustrates the cards with RWS pictures, saying that "the attitudes, actions, and expressions of the symbolic figures, in most cases, fit the general personality of the cycle rather closely, and thus the cards are of value, as well as of interest, in the interpretation of the symbols and descriptions."
There is some slight historical interest here, in that she must be one of the first, if not the first, author other than Waite to refer to and use RWS illustrations for a tarot book (this is assuming, of course, that she used the RWS cards for the first edition of her book in 1941; perhaps she only used them when she revised the book for its 1986 publication).
She goes to great pains to justify and defend her theory by referring to quantum physics and modern psychological methods.
Really the only thing one can do with this book is look up birthdays for generalized birth personality descriptions. No other use for the system is mentioned in the book. It might have been interesting, for example, to discuss how one's place in the present-day cycles might affect one, as in transits.
-- Lee