Transportation website (页面存档备份,存于互联网档案馆) Colorado Highway Data New Colorado Highway Maps Old Colorado Highway Maps The Highways of Colorado by Matthew Salek
West: Journals, Letters, and Images from the 1871 Hayden Expedition. U of Nebraska Press. 2003-09-01: 208 [2013-12-01]. ISBN 978-0-8032-8289-6. (原始内容存档于2014-01-03)
National Forest. U.S. Forest Service. [2012-10-20]. (原始内容存档于2012-10-17). Nebraska National Forests and Grasslands. U.S. Forest Service. [2012-10-20]. (原始内容存档于2012-10-16)