Hidden worlds.
| Published: |
Washington, D.C.:
National Geographic Society,
1981
|
|---|---|
| Series: | Books for world explorers
|
| Subjects: |
| Item Description: | Includes index |
|---|---|
| Physical Description: | 104 pages: some colour illustrations; 27 cm |
| Bibliography: | Includes bibliographical |
| ISBN: | 9780870443367 0870443410 0870443364 |