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- Lewis and Clark Expedition (1804-1806)71
- West (U.S.)69
- Railroads--United States--Maps45
- Railroads--West (U.S.)--Maps24
- Mexican War, 1846-1848--Maps16
- Railroads15
- Railroads--Texas--Maps15
- Railroads--Connecticut--Maps14
- Railroads--Canada--Maps13
- Railroads--New York (State)--Maps13
- Discoveries in geography11
- Railroads--New England--Maps11
- Gettysburg, Battle of, Gettysburg, Pa., 1863--Maps9
- Gold mines and mining --California --History --19th century --Personal narratives9
- Gold mines and mining --North America --History --19th century9
- Gold mines and mining --Sierra Nevada (Calif. and Nev.)9
- Gold mines and mining --United States --History9
- Gold mines and mining --West (U.S.) --History --19th century9
- Land grants--Texas--Maps9
- Scientific expeditions9