ROWLING, J K, Harry Potter and the Philosopher's Stone, 1st soft cover edition, 1997, number line from 30 to 25. With The Chamber of Secrets, 1st soft cover edition 1998, number line 10 to 1. With Harry Potter and the Philosopher's Stone, adult edition with black and white illustration of a train on front cover. 1st soft cover edition 1998, number line runs from 10 to 2. Four words on one page have been highlighted in yellow.