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Peters, David. "Dating of Six Historic Sites in Harford County, Maryland, Using 18th-century Clay Pipe Stem Fragments." Maryland Archeology, 50 (May 2014): 14-18.
Custer, Jay F., and Daniel Coates. "Jasper Formation Processes at the Liles Site (18HA7), Harford County, MD, and Delaware Chalcedony Complex Sites of Cecil County, MD, and New Castle, DE." Maryland Archeology, 53 (September 2020): 1-16.