| Type |  Map |
| ชื่อเรื่อง | Western migration [map] : dreams of gold and a better life drive mass movement ; The pathfinders : exploring the far frontiers / produced by National Geographic Maps for National Geographic Magazine |
| ผู้แต่ง | National geographic maps (firm) |
| พิมพลักษณ์ | Washington, D.C. : National Geographic Society, c2000 |
| รูปเล่ม | 2 maps on 1 sheet : both sides, col. ; sheet 57 x 89 cm., folded to 15 x 23 cm |
| หัวเรื่อง | Explorers --West (U.S.) [] |
| | Migration, Internal --West (U.S.) --Maps [] |
| | Overland journeys to the pacific --Maps [] |
| | Trails|zwest (U.s.) --Maps [] |