Catts, W. P., Shaffer, M., & Custer, J. F. (1986). Phase I & II archaeological investigations of the Route 7 North Corridor, Milltown to the Pennsylvania State line, New Castle County, Delaware. [Dover]: Delaware Dept. of Transportation.

Catts, Wade P., Mark Shaffer, and Jay F. Custer. Phase I & II Archaeological Investigations of the Route 7 North Corridor, Milltown to the Pennsylvania State Line, New Castle County, Delaware. [Dover]: Delaware Dept. of Transportation, 1986.

Catts, Wade P., Mark Shaffer, and Jay F. Custer. Phase I & II Archaeological Investigations of the Route 7 North Corridor, Milltown to the Pennsylvania State Line, New Castle County, Delaware. [Dover]: Delaware Dept. of Transportation, 1986.