Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: U.S. Geological Survey. OCLC 32889555. สืบค้นเมื่อ November 7, 2013 – โดยทาง University of North Texas Libraries.
↑ Weingroff, Richard (2013-10-17). "Ask the Rambler: What Is The Longest Road in the United States?". Federal Highway Administration. US Department of Transportation. สืบค้นเมื่อ 2014-12-04. The longest road in the United States was once the second longest: U.S. 20 from Boston, Massachusetts, to Newport, Oregon. ~. The description of U.S. 20 in the Joint Board's report of October 30, 1925, read (all spellings as in the original): "From Boston, Massachusetts, to Springfield, Pittsfield, Albany, New York, Auburn, Batavia, Buffalo, Erie, Pennsylvania, Cleveland, Ohio, Maumee, South Bend, Indiana, Chicago, Illinois, Rockford, Dubuque, Iowa, Waterloo, Webster City, Sioux City, O'Neill, Nebraska, Chadron, Lusk, Wyoming, Casper, Shoshoni, Greybull, Yellowstone National Park, Idaho Falls, Idaho, Pocatello, Twin Falls, Boise, Payette, Pendleton, Oregon, Umatilla, The Dalles, Portland, Astoria." The Secretary of Agriculture forwarded the Joint Board's report to the American Association of State Highway Officials (AASHO) for adoption. This transmittal reflected the fact that the States owned the roads. AASHO asked the States for their concurrence in the Joint Board's proposed plan and numbering.
Illinois Highway Ends: US 20 2013-12-07 ที่ เวย์แบ็กแมชชีน
Indiana Highway Ends: US 20 2014-07-19 ที่ เวย์แบ็กแมชชีน
US 20 Travelogue in New York at Empire State Roads
"On Route 20, Where the Past Is Present": August 11, 2006, article in The New York Times Escapes section.
Flickr Group for photos taken along US 20
US 20 as USends.com
Twenty West: The Great Road Across America—book about US 20
Historic US Route 20 Association Site dedicated to the preservation and promotion of Historic US Route 20
มีนาคม 10, 2022
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Administration US Department of Transportation subkhnemux 2014 12 04 The longest road in the United States was once the second longest U S 20 from Boston Massachusetts to Newport Oregon The description of U S 20 in the Joint Board s report of October 30 1925 read all spellings as in the original From Boston Massachusetts to Springfield Pittsfield Albany New York Auburn Batavia Buffalo Erie Pennsylvania Cleveland Ohio Maumee South Bend Indiana Chicago Illinois Rockford Dubuque Iowa Waterloo Webster City Sioux City O Neill Nebraska Chadron Lusk Wyoming Casper Shoshoni Greybull Yellowstone National Park Idaho Falls Idaho Pocatello Twin Falls Boise Payette Pendleton Oregon Umatilla The Dalles Portland Astoria The Secretary of Agriculture forwarded the Joint Board s report to the American Association of State Highway Officials AASHO for adoption This transmittal reflected the fact that the States owned the roads AASHO asked the States for their concurrence in the Joint Board s proposed plan and numbering Endpoints of US highways khlngkhxmuleka ekbcak aehlngedim emux 2014 02 23 subkhnemux 9 October 2014 Unknown parameter deadurl ignored help hnngsuxxanephim aekikhNelson Mac 2008 Twenty West The Great Road across America State University of New York Press ISBN 978 0 7914 7469 3 Czarnecki Michael 1997 Twenty Days on Route 20 FootHills Publishing ISBN 0 941053 01 6 aehlngkhxmulxun aekikhkhxmmxns miphaphaelasuxekiywkb thanghlwngshrthhmayelkh 20Galena Bypass project homepage Archived 2012 05 25 thi ewyaebkaemchchin Illinois Highway Ends US 20 Archived 2013 12 07 thi ewyaebkaemchchin Indiana Highway Ends US 20 Archived 2014 07 19 thi ewyaebkaemchchin US 20 Travelogue in New York at Empire State Roads On Route 20 Where the Past Is Present August 11 2006 article in The New York Times Escapes section Flickr Group for photos taken along US 20 US 20 as USends com Twenty West The Great Road Across America book about US 20 Historic US Route 20 Association Site dedicated to the preservation and promotion of Historic US Route 20 ekhathungcak https th wikipedia org w index php title thanghlwngshrthhmayelkh 20 amp oldid 9568637, wikipedia, วิกิ หนังสือ, หนังสือ, ห้องสมุด,
