An Open Textbook (S.W. Ellingson)
Electromagnetics Volume 1 by Steven W. Ellingson is an open textbook covering electric and magnetic fields, transmission lines, vector analysis, electrostatics, magnetostatics, time-varying fields, and plane waves.
This is the web edition of the open textbook by Steven W. Ellingson (Virginia Tech), licensed CC BY-SA 4.0. The print edition of record is available at doi.org/10.21061/electromagnetics-vol-1.