A set of problem books and reference books perfect for preparing for the radio technician exam. * Special Class Radio Technician Problem & Answer Collection 2021 Edition * Complete Pass Special Class Radio Technician Problem & Answer Collection 2015 Edition * Maritime Special Radio Technician Standard Textbook: Radio Engineering, Regulations, and English Set of 3 books Thank you for viewing. I am selling these because I successfully passed the exam. I purchased all of these. Originally, there are notes and writings, as well as wrinkles and folds. With these 5 books, I passed the Maritime Special Radio Technician, 2nd Class Maritime Radio Technician, and 2nd Class Land Radio Technician exams on the first try. Having the standard textbook will deepen your understanding.