I especially enjoyed the derivation of the electromagnetic field of an arbitrarily moving point charge and the derivation of the electromagnetic field of a point charge moving with constant velocity by eliminating the retarded time.  This was in the last chapter Potentials and Fields.  The emphasis is on the physical fields E and B rather than on the constituent fields D and H.  For instance, the magnetic field of a uniformly magnetized sphere is obtained by using the bound current density curl M and the bound surface current M x n.  Electromagnetic fields in matter are given a cursory but well-presented treatment.  Everything is explained and tied together well.  For instance, Ampere's Law and div B=0 are derived from the Biot-Savart law.  Explanations of how what physically happens is the same regardless of what frame of reference is used to do the calculations are well done.  The derivation of the stress energy tensor in the chapter on Conservation Laws is also well done.  The transformation of the fields under a Lorentz transformation are obtained and the 4-vector potential Au and the field tensor Fuv are presented in the chapter Electrodynamics and Relativity near the end of the book.  There are many entertaining carefully carried out calculations that prove a point.  For instance, in one reference frame a long wire carries a current but is uncharged and creates a magnetic force that creates a force on a point charge moving parallel to the wire. But in the reference frame moving with the point charge, the magnetic field exerts no force but there is an electric field created by the fact that the positive and negative charges in the wire have different Lorentz contraction factors so that in this reference frame the wire has a linear charge density and creates an electric field which creates the same force (when appropriately Lorentz transformed) upon the point charge.  The author also shows that a rectangular current loop in a constant uniform electric field parallel to one side of the loop has a linear (“hidden”) momentum.