I wouldn't raise Russ' book to be the be-all and end-all. Certainly, there were several NQR points in the early edition as I recall .. my copy is somewhere in the archives at home .. haven't seen it in years.
An easy and useful read for pilots, certainly.
Trev's groups over the years have been a bit more in depth due to the greater technical grasp of his writers .. for instance, in the early days his met work was done by Nimbus and, in later years, he had Dave Robson, an experienced ex-RAAF TP, involved. I certainly wouldn't discount that series of books .. albeit with the caveat that I haven't read any in recent years so it is possible that my comments are a tad dated.