<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/#comment-17960>
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"A wrinkle: \n  \nhttp://en.wikipedia.org/wiki/Caterpillar_Sixty \n  \nThis says that the Caterpillar Sixty was actually designed and built by C.L. Best, the company Holt merged with to form Caterpillar, starting in 1919. If Caterpillar was a Holt brand, would there be Sixtys with the Caterpillar name on them before the merger in 1925? \n  \n-Jim \n"
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>