Delle, James A. and Levine, Mary Ann (2004) "Excavations at the Thaddeus Stevens and Lydia Hamilton Smith Site, Lancaster, Pennsylvania: Archaeological Evidence for the Underground Railroad," Northeast Historical Archaeology: vol. 33 33, Article 10.
Phase IB/II and data-recovery archaeological excavation at Site 36LA1494 Queen Street Station Phase II (RRTA) North Queen Street and East Chestnut Street, Lancaster, Pennsylvania