<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/#comment-17963>
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"Dave, \n  \nThis sleuthing is fun...right up until it's not.  1925 and later sure is late to be laying brick roads!  Indiana was busy concreting its section of the National Road by this time.  At any rate, this 1925 (or later) date doesn't jibe with the Illinois road maps I found, which show the road as hard surfaced in 1924. \n  \nAt some point it's time to shrug the shoulders. I'm saying ca 1925 for these photos now and will remain open to more evidence that gives me a more precise date.  This in no way diminishes the joy of this find, though!! \n  \nAs for the tractor being a Sixty, if you blow the photo up to full size (click it; it will take you to Flickr where you can do that), you can see part of the SIXTY logo down the side of the radiator. \n  \n-Jim \n"
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>