00706cam a2200229 4500 102513840 TxAuBib 19990827120000.0 990827s1996||||||||||||||||||||||||und|u 9780684811079 0684811073 TxAuBib Ambrose, Stephen E. Undaunted Courage. Simon & Schuster, 1996. 19990827. Lewis, Meriwether, 1774-1809. Lewis and Clark Expedition (1804-1806.) Clark, William, 1770-1838. Jefferson, Thomas, 1743-1826. Explorers-United States-Biography.