Nancy Douglas, Reading Explorer 1 VIDEOS (Student's book, Audio, Video) Heinle, - flv 400 kbps, 480*360 (4:3) 29,97 fps, 64 kbps, 44.1 KHz, 2 channels Reading Explorer is a four-level reading series which uses carefully adapted National Geographic text, images and video to develop reading and vocabulary skills for learners of English.