• Millions of Maps
  • On the Road
  • William Clark

More than 4.5 million items are held in The Geography and Map Division of the Library of Congress in Washington D. C.

On road maps, all interstate highways going east and west have even numbers. All interstate highways going north and south have odd numbers.

William Clark, co-captain of the Lewis and Clark Expedition, made many excellent maps. He was the first to chart much of the land, rivers, and mountains west of the Mississippi River.