When I got the book I was shocked at how thin it was. For the price as a student guide, I expected a tome not a large magazine.  I didn't look at the amount of pages in the product discription.  But as I read through it, I found it to be a very helpful book.  It shows the physical insight needed to understand how the theory was formulated as a vector field.(Maxwell's original equations were algerbraic with twenty unknowns, the current differential form was created by a self taught engineer, Oliver Heaviside)  A nice little complement to any course in EM theory.