Reader's Digest The Earth, Its Wonders, Its Secrets Intelligence in Animals by Reader's Digest. Published in 1996 by The Reader's Digest Association Limited. This is a hardback book with 160 pages and an ISBN#0-895777-913-7. The front cover of the book has a scratch at the top edge middle. The spine of the book shows the slightest wear. The top and bottom of the spine is bent inward a little. The back cover shows wear at the edges and corners. The back also has scratches and rub marks on it. The pages appear to be crisp and clean.