RAGBRAI XLIII: Day 1, July 19, 2015, ca. 1970/1971 John Deere 4020 Tractors

Along the Day 1 RAGBRAI XLIII route on July 19, 2015 were these ca. 1970/1971 John Deere 4020 Tractors:

Previous articles in the series:
RAGBRAI XLIII: Sioux City, Iowa, Party Like its 1973: Stage and Banner
RAGBRAI XLIII: Sioux City, Iowa, Party Like its 1973: Damon Dotson
RAGBRAI XLIII: Sioux City, Iowa, Party Like its 1973: Huey Lewis and the News
RAGBRAI XLIII: Day 1, July 19, 2015, Kingsley, Iowa: Chad D. Groepper Memorial 
RAGBRAI XLIII: Day 1, July 19, 2015, 1914 Ford Model T