1982 - Observational Astronomy for Amateurs (Other) → Paperback ISBN-13: 9780894900679 ISBN-10: 0894900676 Genre: Science & Math ? 1981 - Amateur Astronomer's Handbook (Paperback) → Paperback, Hardcover ISBN-13: 9780486240343 ISBN-10: 0486240347 Genres: Reference, Science & Math 1 1980 - Amateur Astronomer's Handbook (Other) → Paperback, Hardcover ISBN-13: 9780894900495 ISBN-10: 0894900498 Genre: Science & Math ? Observational Astronomy for Amateurs (Paperback) ISBN-13: 9780486240336 ISBN-10: 0486240339 Genre: Science & Math ? |