| 1. |  | Map of Lewis and Clark's track across the western portion of North America, from the Mississippi to the Pacific Ocean by order of the executive of the United States in 1804, 5 & 6 | Explorers; Maps; Rivers; Trails & paths; | Samuel Lewis drew this map of the trail followed by the Corps of Discovery in 1804, 1805, and 1806. He published the map in 1814. |
