Classic Kid's Books Research Questionnaire

Would you like to help me research why certain classic kids books are still popular today? If so leave a comment with your e-mail address and I'll send you a copy of my questionaire. I have both a child and an adult version, so let me know which one you'd like. If you could get a friend or family member to fill one in too, I'd be even more grateful. Don't worry about your e-mail address appearing in the comments box. All comments are filtered by me before being published. I won't publish your address if you don't want me to. The three classic books I'm using in my research are Treaure Island, Winnie the Pooh and the Wind in the Willows. It doesn't matter if you haven't read all of them, your comments will still be relevant. Even if you haven't the time or the notion to complete the questionairre I'd welcome any comments at all on reasonsyou think these three books are still popular. Which is your favourite and why? The research is for an essay as part of the Histories of Literature module of my MA in Writing for Children.