...an exhibit at the University of Pennsylvania's Museum of Archaeology and Anthropology, on the Lenape who stayed behind, the "hidden Indians" of PA. The exhibit apparently includes a picture of a cairn from Oley Hills. Fred Werkheiser and Bob Redhawk are mentioned, Redhawk as a curator.
Article here. Quote: "A Werkheiser photograph of a distinctive cairn in eastern Berks is one of the first items visitors see when they enter the display area."
Museum exhibit pages here.