| Collection: | The National Geographic Society publications |
| Date: | 1972 |
| Publisher: | National Geographic Society, Washington D.C. |
| Scale: | 1:2250000 |
| Author/Editor/Maker: | Grosvenor, Melville Bell |
| Height: | 47 cm |
| Width: | 61 cm |
| Parsons Code: | G |
| Notes: | Includes "The Yardstick of time in middle America". |
| Description: | Map / Chart / Plan |
