MS 2372 Garrick Mallery Collection on Sign Language and Pictography / Series 3: Materials on Pictographs and Petroglyphs / 3.1: Correspondence, drawings, and photographs filed by U.S. state and county (or other locality)
MS 2372 Garrick Mallery Collection on Sign Language and Pictography / Series 3: Materials on Pictographs and Petroglyphs / 3.1: Correspondence, drawings, and photographs filed by U.S. state and county (or other locality) / Pennsylvania