You can download the famous artists course from here and check it out for yourself. The books are no longer in print since they are older.
https://www.deviantart.com/cissie/journal/Famous-Artists-Course-all-lessons-1-24-712271472
Aaron Blaise’s courses are ok if you can get a discount. The value I get from them is drawing along with him while he explains the material. My favourites from him are his animal drawing courses. Most are on discount these days so you can pick them up fairly cheap.
I’m always using a variety of learning resources and revisiting the material I have learned. You can only learn so much from one source and need a lot of repetition for the lessons to sink in. Marc’s course here for example has been great for keeping me on track with the term structure, but I still look for other lessons I can pick up from other professional artists that I can squeeze into the structure.