"Drone Textbook Standard Text For Unmanned Aircraft Personnel Examination Levels 3 and 4, 3rd Edition" Price: 2200 yen This is a drone textbook. I bought it and stored it without looking at it. There is a slight fold on the back of the cover only, not the main body. Other than that, it's in almost new condition. Drone Text Drone Textbook Unmanned Aircraft Personnel Examination Level 3 Level 4