| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Blue Horizons | 978-O-87O44-544-6 (O-87O44-544-8) | 1985 |
G.S. · N.G. · n/s · National Geographic · National Geographic Society · National Society · S.U.
National Geographic Society (U. S.) Special Publications Division