1999 - How Come Planet Earth (Paperback) ISBN-13: 9780761112396 ISBN-10: 0761112391 Genre: Children's Books 6 1993 - How Come Every Kid's Science Questions Explained (Paperback) → Paperback ISBN-13: 9781563053245 ISBN-10: 1563053241 Genres: Children's Books, Teen & Young Adult 14 |