The American frontier : our unique heritage / Nelson Beecher Keyes Keyes, Nelson Beecher Frontier thesis. Frontier and pioneer life United States. E179.5 .A47733 1994 973 20 KEA Includes bibliographical references (p. 289-301) and index. New York : Hanover House, c1954. c1954. 1954 Text 306 p. : eng United States Territorial expansion. West (U.S.) History. United States.