The study of electromagnetism in higher education, as a fundamental part of both physics and electrical engineering, is typically accompanied by textbooks devoted to the subject. The American Physical Society and the American Association of Physics Teachers recommend a full year of graduate study in electromagnetism for all physics graduate students. A joint task force by those organizations in 2006 found that in 76 of the 80 US physics departments surveyed, a course using John Jackson 's Classical Electrodynamics was required for all first year graduate students. For undergraduates, there are several widely used textbooks, including David Griffiths ' Introduction to Electrodynamics and Electricity and Magnetism by Edward Purcell and David Morin. Also at an undergraduate level, Richard Feynman 's classic Lectures on Physics is available online to read for free.