1998 - Improving Nature the Science and Ethics of Genetic Engineering (Paperback) → Hardcover ISBN-13: 9780521637541 ISBN-10: 0521637546 Genres: Science & Math, Engineering & Transportation ? 1996 - Improving Nature the Science and Ethics of Genetic Engineering (Hardcover) → Paperback ISBN-13: 9780521454414 ISBN-10: 0521454417 Genres: Science & Math, Engineering & Transportation ? |