1980 - The Mysterious Undersea World [Books for World Explorers] (Hardcover) ISBN-13: 9780870443176 ISBN-10: 0870443178 Genre: Children's Books 2 Mysterious Undersea World (Paperback) → Hardcover ISBN-13: 9780870443220 ISBN-10: 0870443224 Genres: Children's Books, Science & Math ? |