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The article reports on an investigation conducted to gather evidence on the commercial and industrial activities at Vermilion County, Illinois, specifically mill sites, during the tenure of then U.S. President Abraham Lincoln. The McCammon Site, a component of the Menelley Mill site, was located near the community of Potomac, and prehistoric lithic chipping debris, fire-cracked rock as well as wooden structures were found in this area. Archaeological investigations produced historic artifacts such as ceramics, bottle glass, brick fragments, etc.