Home › Authors › Powers, Ph.D., Don 👤 Powers, Ph.D., Don 3 books Books by Powers, Ph.D., Don Astronomy, Grades 5 - 8 Astronomy, Grades 5 - 8 2009 Electricity and Magnetism, Gra Electricity and Magnetism, Grades 5 - 8+ 2009 Solar System, Grades 5 - 8+ Solar System, Grades 5 - 8+ 2009