Jim Harmon was heavily into Old-Time Radio, and this book provides an overview of some of the radio dramas that used to be broadcast mostly in the 1940s. This is an excellent book for mnostalgia[philes, though now that many of the shows are vavailable through various dealers, it can act as a guide for those being introduced to the recordings of the older shows.
The author has writteb other books on the subject, notably The Grest Radio Heroes. Harmon loved his subject, and it shows in his writings.