1883 In 1883, President Arthur was nearing the end of his journey through Wyoming and Yellowstone National Park. On August 28, the President and his party camped near the Grand Canyon of the Yellowstone. "The Canon of the Yellowstone ... surpasses description in grandeur. The two falls are equal in sublimity and beauty to any upon the continent."
1894 Cleo Post Office was established on August 28, 1894 in Fremont County prior to the formation of Sublette County.1907 The Cheyenne Daily Leader of August 28, 1907 published an article about the coal mines near Sheridan. The article included information about the new town of Kooi or Kooiton, named after Peter Kooi.