This book, highly recommended by Goldstein near the end of the 2nd edition of his Classical Mechanics, explains the formulations of Maxwell's equations suitable for quantization. it also presents a group-theoretical approach to special relativity, discusses radiation in detail; and its last chapter discusses the limitations of classical electrodynamics such as pre-acceleration; a topic rarely found outside specialized texts like Rohrlich's Classical charged particles.
This book is for the theoretically inclined and complements advanced standard standard texts like Jackson's or Landau & Lifschitz', Other texts developing a Lagrangian for fields include Fulvio Melia's Electrodynamics, and Bo Thide's book which latter is mainly available online. All in all a suitable follow on for a 1st course in electricity and magnetism.
The only thing to ignore in this 1964 book reprint is the pre-quark short discussion of the application of Yang Mills gauge theory to what are now known to be composite particles.