The Complete Joy of Homebrewing Fourth Edition contains lots of good information about the brewing process and use of different sugars, ingredients such as berries, coriander, chocolate and when to add them.
There is also a useful description of different hops, basic guidelines of quantities of malts and hops to use for various styles of beer and a significant number of recipes. Unexpectedly there are also a number of different Mead recipes. There is even a section on growing hops.
The coverage of Brew In A Bag (BIAB) was quite light and I didn't see any coverage on how to scale a recipe (maybe I missed it).