Highway Ends: US20Indiana Highway Ends: US20In Search of...U.S. Route20in Ohio by Michael G. Buettner, February 2006 US20 Travelogue in New York(页面存档备份,存于互联网档案馆)
Smith, Edward E. THE SWAN'S LANDING SITE (12HR304): AN EARLY ARCHAIC (KIRK HORIZON) SITE IN HARRISON COUNTY, SOUTH-CENTRAL INDIANA. Midcontinental Journal
156 - LaSalle 157 - Streeterville/Taylor 165 - West 65th 169 - 69th-UPS Express 170 - U. of Chicago/Midway 171 - U. of Chicago/Hyde Park 172 - U. of Chicago/Kenwood