topic

• Discoveries in geography1
• Discovery and exploration1
• Early maps1
• Fortification1
• Geology1
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name

• Abert, John James, 1788-18632
• United States. Army. Corps of Topographical Engineers2
• Ackerman Lithr1
• Bache, Hartman, 1797-18721
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collection

• Maps of North America3

place

• West (U.S.)2
• Missouri River1
• Missouri River Watershed1
• Oregon National Historic Trail1
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genre

• Maps3

publisher

• U.S. War Dept1
• publisher not identified1

division

type

• cartographic3