I've been demonstrated that magnetism is a consequence of special relativity, with a given single example. I'm more and more insterested with the subject and eager to read any text on the topic --I'm tired of empirical magnetism! If you know any freely available resource/paper on the subject, could you please post it here? So far, I've found "Electricity, Relativity and Magnetism: A Unified Text", which is a $340! Ouch!