Cremeens, D.L., Hart, J.P., Darmody, R.G., 1998. Complex Pedostratigraphy of a Terrace Fragipan at the Memorial Park Site, Central Pennsylvania. Geoarchaeology 13, 339-359. doi:10.1002/(SICI)1520-6548(199804)13:4<339::AID-GEA1>3.0.CO;2-3