| National Geographic Magazine February 1981 Vol. 159 #4Â |
| National Geographic September, 1981 |
| NATIONAL GEOGRAPHIC MARCH 1981 SPACE SHUTTLE FLIES |
| VINTAGE NATIONAL GEOGRAPHIC MAGAZINE COLLECTIBLE 1981's |
| National Geographic January, 1981 |
| VINTAGE NATIONAL GEOGRAPHIC WHOLE YEAR 1981 + BONUS |
| National Geographic December, 1981 |
| National Geographic- July 1981- Saturn- Buffalo Bill |
| NATIONAL GEOGRAPHIC VOL.160 #1 JULY 1981 - SATURN RINGS |
| National Geographic May 1981 Eskimo & Viking Artic Find |
| National Geographic - 1981 - Complete Year |
| NATIONAL GEOGRAPHIC VOL.160 #5 NOV 1981 - ALDO LEOPOLD |
| NATIONAL GEOGRAPHIC APRIL 1981 IRELAND, GORILLAS, S.D. |
| National Geographic : September, 1981 |
| National Geographic October, 1981 |
| National Geographic June, 1981 |
| NATIONAL GEOGRAPHIC VOL.159 #2 FEB 1981 - WHERE OIL & |
| NATIONAL GEOGRAPHIC VOL.159 #5 MAY 1981 - SHARKS |
| National Geographic : October, 1981 |
| National Geographic Mag Aug 1981 SHARKS-MAYA ART |
| National Geographic May 1981 STATE OF IOWA |
| NATIONAL GEOGRAPHIC 1981 ENERGY SPECIAL REPORT |
| National Geographic November, 1981 |
| National Geographic July, 1981 |
| NATIONAL GEOGRAPHIC JAN 1981 MT ST. HELENS, POMPEII |
| National Geographic Dec 1981 MOUNT ST HELEN'S AFTERMATH |
| 3 NATIONAL GEOGRAPHIC MAGAZINES 1981 Sept, Nov, Dec |
| National Geographic Magazines July-Dec 1981 Leather Set |
| 5 NATIONAL GEOGRAPHIC MAGAZINES 1981 August - December |
| The Mighty Aztecs -National Geographic Society 1981 |
| VOYAGER 1 & SATURN National Geographic July 1981 |
| National Geographic Solar System Saturn Map Maps 1981 |
| 10 National Geographic -1981 thru 1991 |