Department of the Interior, Harold L. Ickes, Secretary, General Land Office, Fred W. Johnson, Commissioner, Map of the United States, Showing Routes of Principal Explorers and Early Roads and Highways, from data prepared by Frank Bond, Chief Clerk, Fourth Edition, 1937, First Edition, 1907. Engineer Reproduction Plant, U.S. Army, Washington Barracks, D.C. Engraved by R.F. Bartle & Co., Washington, D.C.