The focus of this book is necessarily on shallow wells, as deep wells require professional drilling, never the less the author covers well pumps, casing, storage devices and filtration systems with enough technical detail to meet most needs. Deep wells and methods are covered, just not in detail.
If you need to know how to identify and correct contamination you'll find it here. Need to compute water needs? Pump and storage specifications? Those are also here. In fact, you'll be pleased with the technical details and comparisons in an easy to read style.
I must have missed the new age stuff or at least forgot it as I read the whole book.
If you want to find water in a rural area, and develop it yourself, this is the book. I would not recommend "Cottage Water Systems" if you want detail on well systems.