<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/#comment-17947>
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"The Terre Haute to St. Louis route that follows the National Road. Or any route that passes through Marshall, IL, on the National Road, really.  Just trying to look for whatever clues they might give about when the road was bricked/concreted.  It's brick from the state line through Marshall to about Martinsville, where it becomes concrete to Effingham.  What do your guides say about the roads through there? \n  \n-Jim \n"
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>