This is a report to the American Philosophical Society summarizing archaeological data on Pennsylvania tumuli contained in manuscripts deposited in its library. This report includes essays on earlier theories, the position of the Iroquois, Carpenter's conclusions, and summaries of the Irvine Mounds group and the Sugar Run Mounds. There are also essays on Sugar Run pottery and skeletal remains by James B. Griffin and T. Dale Stewart.

These are site reports on archaeological excavations in northern and western Pennsylvania and upstate New York. Most of the excavations were sponsored by the Pennsylvania Historical Commission (1929-1948). The reports include photographs, maps, and diagrams.