It is a basic introductory book written (pre-internet) for car modelers who may have never strayed from that realm and need help on how to get started. It covers (all in one place) most of the planning, materials and details one could use to create a nice setting for model cars. It is still totally relevant, especially for the car builder who does not want to become a diorama specialist. More advance diorama builders should already be familiar with the material in this book.
If interested, I agree you should search for a reasonably priced edition.