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Accokeek Furnace was due north of Dermott's Branch and, yes, it was built on land leased by Augustine. Principio Iron Company, builder of Accokeek, owned several thousand acres in the area and they leased a few more thousand. That sounds like a tremendous amount of land, but they were fueling the furnace with charcoal and it took a minimum of 8,000 acres to produce enough wood to keep the furnace in use continuously.
I wish I could pinpoint Cedar Hill, but I don't know where it was. Unless property names remained in use long enough to be included on the land tax records, they were often lost. There were a number of farms around the county whose owners gave them names, but the names ceased to be used (or were changed) and we just don't know where they were. Since I couldn't tell from Anne Dermott's letter whether she was writing from her mother's or aunt's house, I just don't know. I have a pretty good idea of the location of Mary James' house, but that's about it.